Multi-gear direct current measurement box and multi-gear direct current measurement system

Abstract

The utility model provides a multi-gear direct current measurement box and a multi-gear direct current measurement system, which can be applied to the field of superconducting quantum computing. The multi-gear direct-current measurement box comprises a power supply module, a current limiting module and an external port module, wherein the power supply module is used for supplying power to the Josephson junction normal-temperature resistor; the first end of the current limiting module is electrically connected with the first end of the power supply module, and the current limiting module is used for controlling the test power of the power supply module for supplying power to the Josephson junction normal-temperature resistor; the external port module comprises a sampling resistor, a first switch and a wiring port sub-module, the external port module is used for switching to a four-lead method test mode to detect the Josephson junction normal temperature resistance under the condition that the first switch is closed, and switching to a four-lead method test mode to detect the Josephson junction normal temperature resistance under the condition that the first switch is disconnected; the normal-temperature resistance of the Josephson junction is detected by switching to a two-lead method test mode, and the wiring port sub-module is electrically connected with the probe station and the source meter, so that electrical parameters of the normal-temperature resistance of the Josephson junction can be tested through a probe of the probe station.

Description

Technical Field

[0001] The utility model relates to the field of superconducting quantum computing, and more specifically to a multi-level direct current measurement box and a multi-level direct current measurement system. Background Art

[0002] In the field of superconducting quantum computing, a small current power supply is usually used to detect the constant temperature resistance of the Josephson junction. In the prior art, the supply voltage in the small current power supply is usually a voltage at the millivolt level. The small current power supply is used with a probe station and a source meter to measure the constant temperature resistance of the Josephson junction through a two-lead or four-lead test method. However, the cost of the small current power supply is high. In order to facilitate testing, the R&D personnel use a self-made measurement box with a probe station and a source meter to detect the electrical parameters of the constant temperature resistance of the Josephson junction.

[0003] In the process of realizing the above-mentioned utility model concept, the inventor discovered that: in the field of superconducting quantum computing, the power supply specifications and lines of the existing measurement boxes are not unified, which leads to operational confusion. At the same time, the existing measurement boxes cannot meet the line switching of the two-lead measurement method and the four-lead measurement method, which reduces the accuracy of the tested Josephson junction room temperature resistance and reduces the test efficiency. Technical problems. Utility Model Content

[0004] In view of the above problems, the utility model provides a multi-level DC measurement box and a multi-level DC measurement system.

[0005] According to a first aspect of the utility model, a multi-speed DC measuring box is provided, which is applied to the field of superconducting quantum computing. The multi-speed DC measuring box comprises: a power supply module, a current limiting module and an external port module; wherein the power supply module is used to supply power to a Josephson junction constant temperature resistor; the current limiting module, wherein a first end of the current limiting module is electrically connected to a first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor; and the external port module, wherein the external port module comprises a sampling resistor, a first switch and a wiring port submodule, wherein a first end of the sampling resistor is electrically connected to a second end of the current limiting module, and a second end of the sampling resistor is electrically connected to a second end of the power supply module. The first end of the first switch is electrically connected to the second end of the current limiting module, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the external port module is electrically connected to the second end of the current limiting module, and the second end of the external port module is electrically connected to the second end of the power supply module. The external port module is used to switch to the four-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is closed, and switch to the two-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is disconnected. The wiring port submodule is electrically connected to the probe station and the source meter to facilitate testing the electrical parameters of the Josephson junction constant temperature resistor through the probe of the probe station.

[0006] According to an embodiment of the utility model, the power supply module includes a DC source, a first gear shifter and a second switch; wherein, the DC source, the first end of the DC source is electrically connected to the first end of the second switch, the second end of the DC source is electrically connected to the first end of the first gear shifter, and is used to supply power to the Josephson junction constant temperature resistor; the first gear shifter, the first end of the first gear shifter is electrically connected to the second end of the DC source, the second end of the first gear shifter is electrically connected to the current limiting module, and is used to select the supply voltage of the DC source; the second switch, the first end of the second switch is electrically connected to the first end of the DC source, the second end of the second switch is electrically connected to the second end of the external port module, and is used to control the circuit of the multi-gear DC measurement box to be turned on or off.

[0007] According to an embodiment of the utility model, a DC source includes a first power supply, a third switch, a second power supply and a fourth switch; wherein, the first power supply, the first end of the first power supply is electrically connected to the first end of the second switch, and the second end of the first power supply is electrically connected to the first end of the third switch; the third switch, the first end of the third switch is electrically connected to the second end of the first power supply, and the second end of the third switch is electrically connected to the first end of the first gear shifter; the second power supply, the first end of the second power supply is electrically connected to the first end of the second switch, and the second end of the second power supply is electrically connected to the first end of the fourth switch; the fourth switch, the first end of the fourth switch is electrically connected to the second end of the second power supply, and the second end of the fourth switch is electrically connected to the first end of the first gear shifter.

[0008] According to an embodiment of the utility model, the current limiting module includes a second gear shifter and a current limiting submodule; wherein, the second gear shifter, the first end of the second gear shifter is electrically connected to the second end of the first gear shifter, the second end of the second gear shifter is electrically connected to the first end of the current limiting submodule, and is used to select the current limiting resistor of the current limiting submodule according to the test power of the Josephson junction constant temperature resistor, so as to output a power supply voltage corresponding to the test power to the Josephson junction constant temperature resistor; the current limiting submodule, the first end of the current limiting submodule is electrically connected to the second end of the second gear shifter, the second end of the current limiting submodule is electrically connected to the external port module, and is used to limit the current of the circuit of the multi-speed DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

[0009] According to an embodiment of the utility model, the current limiting submodule includes a first resistor and a second resistor; wherein; the first resistor, the first end of the first resistor is electrically connected to the second end of the second gear device, and the second end of the first resistor is electrically connected to the external port module; the second resistor, the first end of the second resistor is electrically connected to the second end of the second gear device, and the second end of the second resistor is electrically connected to the external port module.

[0010] According to an embodiment of the utility model, the wiring port submodule includes a first external port, a second external port, a third external port, a fourth external port, a fifth external port, a sixth external port, a fifth switch and a sixth switch; wherein the first external port and the second external port are electrically connected to the source meter; the third external port, the fourth external port, the fifth external port and the sixth external port are electrically connected to the probe station; the fifth switch, the first end of the fifth switch is electrically connected to the fifth external port, and the second end of the fifth switch is electrically connected to the third external port; the sixth switch, the first end of the sixth switch is electrically connected to the fourth external port, and the second end of the sixth switch is electrically connected to the sixth external port.

[0011] The second aspect of the utility model provides a multi-speed DC measurement system, which is applied to the field of superconducting quantum computing. The multi-speed DC measurement system includes: a multi-speed DC measurement box, a probe station and a source meter, wherein the multi-speed DC measurement box includes: a power supply module, a current limiting module and an external port module; wherein the power supply module is used to supply power to the Josephson junction constant temperature resistor; the current limiting module, the first end of the current limiting module is electrically connected to the first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor; the external port module, the external port module includes a sampling resistor, a first switch and a wiring port submodule, the first end of the sampling resistor is electrically connected to the second end of the current limiting module, and the sampling resistor The second end of the first switch is electrically connected to the second end of the power supply module, the first end of the first switch is electrically connected to the second end of the current limiting module, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the external port module is electrically connected to the second end of the current limiting module, and the second end of the external port module is electrically connected to the second end of the power supply module. The external port module is used to switch to the four-lead method test mode to detect the Josephson junction constant temperature resistance when the first switch is closed, and switch to the two-lead method test mode to detect the Josephson junction constant temperature resistance when the first switch is disconnected. The wiring port submodule is electrically connected to the probe station and the source meter to facilitate testing the electrical parameters of the device to be tested through the probes of the probe station.

[0012] According to an embodiment of the utility model, the power supply module includes a DC source, a first gear shifter and a second switch; wherein, the DC source, the first end of the DC source is electrically connected to the first end of the second switch, the second end of the DC source is electrically connected to the first end of the first gear shifter, and is used to supply power to the Josephson junction constant temperature resistor; the first gear shifter, the first end of the first gear shifter is electrically connected to the second end of the DC source, the second end of the first gear shifter is electrically connected to the current limiting module, and is used to select the supply voltage of the DC source; the second switch, the first end of the second switch is electrically connected to the first end of the DC source, the second end of the second switch is electrically connected to the second end of the external port module, and is used to control the circuit of the multi-gear DC measurement box to be turned on or off.

[0013] According to an embodiment of the utility model, the current limiting module includes a second gear shifter and a current limiting submodule; wherein, the second gear shifter, the first end of the second gear shifter is electrically connected to the second end of the first gear shifter, the second end of the second gear shifter is electrically connected to the first end of the current limiting submodule, and is used to select the current limiting resistor of the current limiting submodule according to the test power of the Josephson junction constant temperature resistor, so as to output a power supply voltage corresponding to the test power to the Josephson junction constant temperature resistor; the current limiting submodule, the first end of the current limiting submodule is electrically connected to the second end of the second gear shifter, the second end of the current limiting submodule is electrically connected to the external port module, and is used to limit the current of the circuit of the multi-speed DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

[0014] According to an embodiment of the utility model, the wiring port submodule includes a first external port, a second external port, a third external port, a fourth external port, a fifth external port, a sixth external port, a fifth switch and a sixth switch; wherein the first external port and the second external port are electrically connected to the source meter; the third external port, the fourth external port, the fifth external port and the sixth external port are electrically connected to the probe station; the fifth switch, the first end of the fifth switch is electrically connected to the fifth external port, and the second end of the fifth switch is electrically connected to the third external port; the sixth switch, the first end of the sixth switch is electrically connected to the fourth external port, and the second end of the sixth switch is electrically connected to the sixth external port.

[0015] According to the multi-speed DC measurement box and multi-speed DC measurement system of the utility model, the multi-speed DC measurement box of this embodiment adopts a power supply module, a current limiting module and an external port module, so that the power supply module outputs a power supply voltage and a power supply current, the power supply current passes through the current limiting module, and the current limiting module limits the received power supply current through a built-in high resistor, so that the power supply current after current limiting is transmitted to the external port module, the wiring port submodule in the external port module is electrically connected to the source meter and the probe station, the probe of the probe station is placed on both ends of the Josephson junction constant temperature resistor, the power supply current after current limiting flows into the Josephson junction constant temperature resistor through the probe of the probe station, the source meter displays the voltage at both ends of the Josephson junction constant temperature resistor and the current flowing through the Josephson junction constant temperature resistor, the first switch can control whether the sampling resistor is short-circuited in the two-lead method test mode and the four-lead method test mode. When the external port module is in the state where the first switch is closed, it is characterized by the multi-speed DC measurement box being switched to the four-lead method test mode for the Josephson The Josephson junction constant temperature resistor is detected. When the external port module is in the state where the first switch is disconnected, it is characterized that the multi-speed DC measurement box is switched to the two-lead method test mode to detect the Josephson junction constant temperature resistor, thereby realizing low-power power supply to the Josephson junction constant temperature resistor and avoiding damage to low-power components by large current. At the same time, the electrical parameters of the Josephson junction constant temperature resistor are detected by pre-fixing the test circuits in the two-lead method test mode and the four-lead method test mode, setting the first switch to control the switching of the two-lead method test mode and the four-lead method test mode, unifying the power supply specifications of the multi-speed DC measurement box, avoiding confusion of the lines of the multi-speed DC measurement box, facilitating the switching of the test mode lines to test the Josephson junction constant temperature resistor, improving the test accuracy and the test efficiency of the multi-speed DC measurement box, and further the power supply resistor in the multi-speed DC measurement box can also use an ordinary battery pack, thereby eliminating the need to use a small power supply at the millivolt level, saving the preparation cost of the multi-speed DC measurement box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above contents and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 The structure diagram of the multi-level DC measurement box and the multi-level DC measurement system according to the embodiment of the utility model is schematically shown;

[0018] Figure 2 The circuit diagram of the power supply module according to the embodiment of the utility model is schematically shown;

[0019] Figure 3 The circuit diagram of the current limiting module according to the embodiment of the utility model is schematically shown;

[0020] Figure 4 The circuit diagram of the external port module according to the embodiment of the utility model is schematically shown;

[0021] Figure 5 A schematic diagram of a multi-gear DC measurement box according to an embodiment of the utility model is schematically shown;

[0022] Figure 6 A schematic diagram schematically shows a panel design of a multi-speed DC measurement box according to an embodiment of the utility model;

[0023] Figure 7 The schematic diagram schematically shows the appearance of a multi-speed DC measurement box according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are described to provide a comprehensive understanding of the embodiments of the present invention. However, it is obvious that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0025] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "include", "comprises", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0026] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0027] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0028] In the technical solution of the present utility model, the user information (including but not limited to user personal information, user image information, user device information, such as location information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved are all information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data comply with relevant laws, regulations and standards, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0029] With the development of component detection technology, accurate detection of low-power components has become an indispensable part of the detection process. In order to meet the detection of electrical parameters of low-power components, low-power components are detected by using current sources, probe stations and source meters to obtain the electrical parameters of low-power components. However, high-current current sources can easily damage low-power components during the measurement process, so it is necessary to use low-current current sources with probe stations and source meters to perform electrical detection on low-power components.

[0030] However, the existing low-current current sources are expensive, large in size, and complex to calibrate, so they cannot be promoted. The homemade measurement box cannot switch between the two-lead measurement mode and the four-lead measurement mode, making it impossible to accurately detect low-power components. In the process of researching multi-speed DC measurement boxes and multi-speed DC measurement systems, the researchers found that the related technology has technical problems such as inconsistent power supply specifications and lines of the existing measurement boxes, which leads to confusion in operation. At the same time, the measurement box cannot meet the line switching requirements of the two-lead measurement method and the four-lead measurement method, resulting in reduced test accuracy and low test efficiency.

[0031] In view of this, an embodiment of the utility model provides a multi-speed DC measurement box, including: a power supply module, a current limiting module and an external port module; wherein the power supply module is used to supply power to the Josephson junction constant temperature resistor; the current limiting module, the first end of the current limiting module is electrically connected to the first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor; the external port module, the external port module includes a sampling resistor, a first switch and a wiring port submodule, the first end of the sampling resistor is electrically connected to the second end of the current limiting module, the second end of the sampling resistor is electrically connected to the second end of the power supply module, and the first end of the first switch is electrically connected to the limiting module. The second end of the current module is electrically connected, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the wiring port submodule is electrically connected to the second end of the current limiting module, the second end of the wiring port submodule is electrically connected to the second end of the power supply module, the external port module is used to switch to the four-lead method test mode to detect the Josephson junction constant temperature resistance when the first switch is closed, and switch to the two-lead method test mode to detect the Josephson junction constant temperature resistance when the first switch is disconnected. The wiring port submodule is electrically connected to the probe station and the source meter to facilitate testing the electrical parameters of the device to be tested through the probes of the probe station.

[0032] Figure 1 The structural diagram of a multi-level DC measurement box and a multi-level DC measurement system according to an embodiment of the utility model is schematically shown.

[0033] like Figure 1 As shown, the multi-speed DC measurement box includes: a power supply module 101 , a current limiting module 102 and an external port module 103 .

[0034] According to an embodiment of the utility model, the first end of the power supply module 101 is electrically connected to the first end of the current limiting module 102, and the second end of the power supply module 101 is electrically connected to the second end of the external port module 103. The power supply module 101 is used to supply power to the Josephson junction constant temperature resistor.

[0035] According to the embodiment of the utility model, the Josephson junction constant temperature resistor can be characterized as a nonlinear component that can withstand a small current.

[0036] According to an embodiment of the utility model, the first end of the current limiting module 102 is electrically connected to the first end of the power supply module 101, and the second end of the current limiting module 102 is electrically connected to the first end of the external port module 103. The current limiting module 102 is used to control the test power supplied by the power supply module 101 to the Josephson junction constant temperature resistor.

[0037] According to an embodiment of the utility model, the external port module 103 includes a sampling resistor R3, a first switch K1 and a wiring port submodule, the first end of the sampling resistor R3 is electrically connected to the second end of the current limiting module 102, the second end of the sampling resistor R3 is electrically connected to the second end of the power supply module 101, the first end of the first switch K1 is electrically connected to the second end of the current limiting module 102, the second end of the first switch K1 is electrically connected to the second end of the current limiting module 102, the first end of the wiring port submodule is electrically connected to the second end of the current limiting module 102, the second end of the wiring port submodule is electrically connected to the second end of the power supply module 101, the external port module 103 is used to switch to the four-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch K1 is closed, and switch to the two-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch K1 is disconnected, and the wiring port submodule is electrically connected to the probe station and the source meter, so as to test the electrical parameters of the Josephson junction constant temperature resistor through the probe of the probe station.

[0038] According to an embodiment of the present utility model, the electrical parameters of the Josephson junction constant temperature resistor may include a voltage across the Josephson junction constant temperature resistor, a current flowing through the Josephson junction constant temperature resistor, and a resistance of the Josephson junction constant temperature resistor.

[0039] According to an embodiment of the present invention, the source meter can be characterized as an instrument for displaying the voltage across the Josephson junction constant temperature resistor and the current flowing through the Josephson junction constant temperature resistor. For example, the source meter can be a multimeter.

[0040] According to an embodiment of the utility model, the sampling resistor R3 is used to eliminate the test error of the Josephson junction constant temperature resistor by the power supply module 101 and the current limiting module 103 when switching to the two-lead method test mode to test the Josephson junction constant temperature resistor.

[0041] According to an embodiment of the present utility model, when the four-lead method test mode is switched to test the Josephson junction constant temperature resistor, the first switch K1 is used to short-circuit the sampling resistor R3.

[0042] According to an embodiment of the utility model, the multi-speed DC measuring box of the present embodiment adopts a power supply module 101, a current limiting module 102 and an external port module 103, so that the power supply module 101 outputs a power supply voltage and a power supply current, the power supply current passes through the current limiting module 102, and the current limiting module 102 limits the received power supply current through a built-in high resistor, so that the power supply current after current limiting is transmitted to the external port module, the wiring port submodule in the external port module 103 is electrically connected to the source meter and the probe station, the probe of the probe station is placed on both ends of the Josephson junction constant temperature resistor, the power supply current after current limiting flows into the Josephson junction constant temperature resistor through the probe of the probe station, the source meter displays the voltage at both ends of the Josephson junction constant temperature resistor and the current flowing through the Josephson junction constant temperature resistor, the first switch K1 can control whether the sampling resistor R3 is short-circuited in the two-lead method test mode and the four-lead method test mode. In the case where the external port module 103 is in the first switch K1 closed, it is characterized by the multi-speed DC measuring box being switched to the four-lead method test mode at this time. The Josephson junction constant temperature resistor is detected in the test mode. When the external port module is in the state where the first switch K1 is disconnected, it is characterized that the multi-speed DC measurement box is switched to the two-lead method test mode to detect the Josephson junction constant temperature resistor, thereby realizing low-power power supply to the Josephson junction constant temperature resistor and avoiding damage to low-power components by large current. At the same time, the electrical parameters of the Josephson junction constant temperature resistor are detected by pre-fixing the test circuits in the two-lead method test mode and the four-lead method test mode, setting the first switch K1 to control the switching between the two-lead method test mode and the four-lead method test mode, unifying the power supply specifications of the multi-speed DC measurement box, avoiding confusion of the lines of the multi-speed DC measurement box, facilitating the switching of the test mode lines to test the Josephson junction constant temperature resistor, improving the test accuracy and the test efficiency of the multi-speed DC measurement box, and further, the power supply resistor in the multi-speed DC measurement box can also use an ordinary battery pack, thereby eliminating the need to use a small power supply at the millivolt level, saving the preparation cost of the multi-speed DC measurement box.

[0043] Figure 2 The circuit diagram of the power supply module according to the embodiment of the utility model is schematically shown.

[0044] like Figure 2 As shown, the power supply module 101 includes: a DC source 201, a first gear shifter D1 and a second switch K2.

[0045] According to an embodiment of the present invention, the first end of the DC source 201 is electrically connected to the first end of the second switch K2, and the second end of the DC source 201 is electrically connected to the first end of the first gear D1, for supplying power to the Josephson junction constant temperature resistor.

[0046] According to an embodiment of the present invention, the DC source 201 includes a first power source, a third switch, a second power source and a fourth switch.

[0047] According to an embodiment of the present invention, a first end of the first power source ε1 is electrically connected to a first end of the second switch K2 , and a second end of the first power source ε1 is electrically connected to a first end of the third switch K3 .

[0048] According to an embodiment of the present utility model, the first power source ε1 may be a battery box, and the supply voltage of the first power source ε1 may be 9V.

[0049] According to an embodiment of the utility model, when the two-lead method test mode is used to detect the Josephson junction constant temperature resistor, the first power supply ε1 of 9V can be used for power supply.

[0050] According to an embodiment of the present invention, a first end of the third switch K3 is electrically connected to a second end of the first power source ε1 , and a second end of the third switch K3 is electrically connected to a first end of the first gear shifter D1 .

[0051] According to the embodiment of the present utility model, when the first power source ε1 is required to supply power to the Josephson junction constant temperature resistor, the third switch K3 needs to be closed.

[0052] According to an embodiment of the present invention, a first end of the second power source ε2 is electrically connected to a first end of the second switch K2 , and a second end of the second power source ε2 is electrically connected to a first end of the fourth switch K4 .

[0053] According to an embodiment of the present utility model, the second power source ε2 may be a dry cell battery, and the supply voltage of the second power source ε2 may be 1.5V.

[0054] According to an embodiment of the utility model, when the four-lead method test mode is used to detect the Josephson junction constant temperature resistor, a second power supply ε2 of 1.5V can be used for power supply.

[0055] According to an embodiment of the present utility model, the first power source ε1 and the second power source ε2 may also be selected as power sources with a supply voltage between 1V and 10V.

[0056] According to an embodiment of the present utility model, a first end of the fourth switch K4 is electrically connected to a second end of the second power source ε2, and a second end of the fourth switch K4 is electrically connected to a first end of the first gear shifter D1.

[0057] According to the embodiment of the present utility model, when the second power source ε2 is required to supply power to the Josephson junction constant temperature resistor, the fourth switch K4 needs to be closed.

[0058] According to an embodiment of the present utility model, the first end of the first gear shifter K3 is electrically connected to the second end of the DC source 201 , and the second end of the first gear shifter K3 is electrically connected to the current limiting module 102 for selecting the supply voltage of the DC source 201 .

[0059] According to an embodiment of the utility model, when it is necessary to select a power supply for the Josephson junction constant temperature resistor, the first gear switch D1 needs to be adjusted to a gear corresponding to the first power supply ε1 or a gear corresponding to the second power supply ε2.

[0060] According to an embodiment of the present utility model, the first end of the second switch K2 is electrically connected to the first end of the DC source 201, and the second end of the second switch K2 is electrically connected to the second end of the external port module 103, which is used to control the circuit of the multi-speed DC measurement box to be turned on or off.

[0061] According to an embodiment of the utility model, a plurality of power supplies for power supply are arranged in this embodiment, the first power supply ε1 and the third switch K3 are connected in series, the second power supply ε2 and the fourth switch K4 are connected in series, a first gear shifter D1 is arranged, and a corresponding power supply is selected according to the test requirements of the low-power components, and the second switch K2 is used as the main switch of the multi-speed DC measurement box, so as to realize power supply to the Josephson junction constant temperature resistor. After determining the power supply, the corresponding switch is closed, and the first gear shifter D1 is adjusted to the corresponding power supply, so as to improve the power supply safety of the multi-speed DC measurement box.

[0062] Figure 3 The circuit diagram of the current limiting module according to the embodiment of the utility model is schematically shown.

[0063] like Figure 3 As shown, the current limiting module 102 includes: a second gear shifter D2 and a current limiting submodule 301 .

[0064] According to an embodiment of the utility model, the first end of the second gear device D2 is electrically connected to the second end of the first gear device D1, and the second end of the second gear device D2 is electrically connected to the first end of the current limiting submodule 301, so as to select the current limiting resistor of the current limiting submodule 301 according to the test power of the Josephson junction constant temperature resistor, so as to output a power supply current corresponding to the test power to the Josephson junction constant temperature resistor.

[0065] According to an embodiment of the utility model, when the test power of the low-power Josephson junction constant temperature resistor is determined, the second gear switch D2 is adjusted to the corresponding current limiting gear so that the power supply current output by the power supply module is limited by the current limiting module 102.

[0066] According to an embodiment of the utility model, the first end of the current limiting submodule 301 is electrically connected to the second end of the second gear device D2, and the second end of the current limiting submodule 301 is electrically connected to the external port module 103, which is used to limit the current of the multi-speed DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

[0067] According to an embodiment of the present invention, the current limiting submodule 301 includes: a first resistor R1 and a second resistor R2.

[0068] According to an embodiment of the present invention, a first end of the first resistor R1 is electrically connected to a second end of the second gear device D2 , and a second end of the first resistor R1 is electrically connected to the external port module 103 .

[0069] According to an embodiment of the present invention, a first end of the second resistor R2 is electrically connected to a second end of the second gear device D2 , and a second end of the second resistor R2 is electrically connected to the external port module 103 .

[0070] According to an embodiment of the present invention, the resistance value of the first resistor R1 and the second resistor R2 ranges from 1000Ω to 9000Ω. For example, the resistance value of the first resistor is 2000Ω and the resistance value of the second resistor is 7000Ω.

[0071] According to the embodiment of the utility model, when the test mode of the Josephson junction constant temperature resistor is determined, the current limiting resistor in the current limiting submodule 301 can be selected according to the test power of the low-power Josephson junction constant temperature resistor.

[0072] According to an embodiment of the utility model, the current limiting resistor in the current limiting submodule corresponding to the test power of the low-power Josephson junction constant temperature resistor is calculated according to formula (1), and formula (1) is as follows.

[0073]

[0074] Among them, P can be represented as the test power of the Josephson junction resistance at room temperature, U x It can be represented as the voltage value of the power supply, x≤2, U1 can be represented as the voltage value of the first power supply, U2 can be represented as the voltage value of the second power supply, R x It can be represented as the resistance value of the current limiting resistor, R1 can be represented as the resistance value of the first resistor, R2 can be represented as the resistance value of the second resistor, R jj It can be characterized as the resistance value of the Josephson junction at room temperature.

[0075] According to an embodiment of the utility model, when it is determined that the test mode of the Josephson junction constant temperature resistor is a two-lead method test mode, the current limiting resistor in the current limiting submodule corresponding to the test power of the low-power Josephson junction constant temperature resistor can also be calculated according to formula (2), and formula (2) is shown below.

[0076]

[0077] Among them, P can be represented as the test power of the Josephson junction resistance at room temperature, U x It can be represented as the voltage value of the power supply, x≤2, U1 can be represented as the voltage value of the first power supply, U2 can be represented as the voltage value of the second power supply, R x It can be represented as the resistance value of the current limiting resistor, R1 can be represented as the resistance value of the first resistor, R2 can be represented as the resistance value of the second resistor, R jj It can be represented as the resistance value of the Josephson junction constant temperature resistor, and R3 can be represented as the resistance value of the sampling resistor.

[0078] According to the embodiments of the present invention, the resistance value of the Josephson junction constant temperature resistor can be estimated and then brought into formula (1) or formula (2) to estimate the resistance value of the current limiting resistor. The estimated resistance value of the Josephson junction constant temperature resistor only needs to be at the same order of magnitude as the resistance value of the Josephson junction constant temperature resistor finally calculated.

[0079] According to an embodiment of the utility model, this embodiment calculates the current limiting resistor required for current limiting according to the test power of the Josephson junction constant temperature resistor, and adjusts the second gear device D2 to the gear of the corresponding current limiting resistor, thereby realizing the current limiting effect on the power supply current output by the power supply module 101, so that the power transmitted to the Josephson junction constant temperature resistor meets the test power, avoids damaging the Josephson junction constant temperature resistor, and improves the accuracy of the test.

[0080] Figure 4 The circuit diagram of the connection port submodule according to the embodiment of the utility model is schematically shown.

[0081] like Figure 4 As shown, the connection port submodule 401 includes: a first external port M1, a second external port M2, a third external port V1, a fourth external port V2, a fifth external port I1, a sixth external port I2, a fifth switch K5 and a sixth switch K6.

[0082] According to an embodiment of the present invention, the first external port M1 and the second external port M2 are electrically connected to the source meter.

[0083] According to the embodiment of the present invention, the third external port V1 , the fourth external port V2 , the fifth external port I1 and the sixth external port I2 are electrically connected to the probe station.

[0084] According to an embodiment of the utility model, the third external port V1 and the fourth external port V2 are used to be electrically connected to a probe station for measuring the voltage of the Josephson junction constant temperature resistor. When performing a voltage test on the Josephson junction constant temperature resistor, the probe station needs to connect the third external port V1 and the fourth external port V2, and then perform a voltage test on the Josephson junction constant temperature resistor through the probe.

[0085] According to an embodiment of the utility model, the fifth external port I1 and the sixth external port I2 are used to be electrically connected to a probe station for measuring the current of the Josephson junction constant temperature resistor. When the current test is performed on the Josephson junction constant temperature resistor, the probe station only needs to be connected to any one of the fifth external port I1 or the sixth external port I2, and then the current test is performed on the Josephson junction constant temperature resistor through the probe.

[0086] According to the embodiment of the present invention, a first end of the fifth switch K5 is electrically connected to the fifth external port I1 , and a second end of the fifth switch K5 is electrically connected to the third external port M1 .

[0087] According to an embodiment of the present invention, a first end of the sixth switch K6 is electrically connected to the fourth external port M2 , and a second end of the sixth switch K6 is electrically connected to the sixth external port I2 .

[0088] According to the embodiment of the present invention, when preparing to test the Josephson junction constant temperature resistor, it is necessary to close the fifth switch K5 and the sixth switch K6, and selectively close the first switch K1 according to the determined test mode.

[0089] According to an embodiment of the present invention, when the Josephson junction constant temperature resistor is tested using the four-lead method test mode, the first switch K1 is closed, and the resistance value of the Josephson junction constant temperature resistor is calculated as shown in formula (3). Formula (3) is as follows.

[0090]

[0091] Among them, R jj It can be characterized as the resistance value of the Josephson junction constant temperature resistor, V(M) can be characterized as the voltage value between the third external port V1 and the fourth external port V2 when the first switch K1 is closed, U can be characterized as the power supply used to power the Josephson junction constant temperature resistor, and R can be characterized as the current limiting resistor used to limit the current of the Josephson junction constant temperature resistor.

[0092] According to an embodiment of the utility model, when the two-lead method test mode is used to detect the Josephson junction constant temperature resistor, the first switch K1 is first closed to obtain the voltage value between the third external port V1 and the fourth external port V2 when the first switch K1 is closed, and then the first switch K1 is opened to obtain the voltage value between the third external port V1 and the fourth external port V2 when the first switch K1 is opened. The resistance value of the Josephson junction constant temperature resistor is calculated according to the voltage value corresponding to the closing of the first switch K1 and the voltage value corresponding to the opening of the first switch K1 as shown in formula (4). Formula (4) is as follows.

[0093]

[0094] Among them, R jj It can be represented by the resistance value of the Josephson junction constant temperature resistor, V(M) can be represented by the voltage value between the third external port V1 and the fourth external port V2 when the first switch K1 is closed, V(M open ) can be represented by the voltage value between the third external port V1 and the fourth external port V2 when the first switch K1 is disconnected, U can be represented by the power supply for the Josephson junction constant temperature resistor, R1 can be represented by the resistance value of the first resistor R1, and R2 can be represented by the resistance value of the second resistor R2.

[0095] According to an embodiment of the utility model, six external ports are set in this embodiment, wherein the first external port and the second external port are connected to a source meter, the third external port and the fourth external port are used to be electrically connected to a probe station for measuring the voltage of a Josephson junction constant temperature resistor, and the fifth external port and the sixth external port are used to be electrically connected to a probe station for measuring the current of a Josephson junction constant temperature resistor, so that the probe station and the source meter are connected to the ports of a multi-speed DC measurement box, and then the probes of the probe station are connected to the two ends of the Josephson junction constant temperature resistor, thereby detecting the electrical parameters of the Josephson junction constant temperature resistor, and only the first switch is required to enable the multi-speed DC measurement box to switch between the two-lead method test mode and the four-lead method test mode to measure the Josephson junction constant temperature resistor, without reconnecting the measurement line, thereby improving the test accuracy and the test efficiency of the Josephson junction constant temperature resistor.

[0096] According to an embodiment of the utility model, a multi-speed DC measurement system includes: a multi-speed DC measurement box, a probe station and a source meter, wherein the multi-speed DC measurement box includes: a power supply module, a current limiting module and an external port module.

[0097] According to an embodiment of the utility model, a power supply module is used to supply power to the Josephson junction constant temperature resistor; a current limiting module, a first end of the current limiting module is electrically connected to a first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor.

[0098] According to an embodiment of the utility model, the external port module includes a sampling resistor, a first switch and a wiring port submodule, the first end of the sampling resistor is electrically connected to the second end of the current limiting module, the second end of the sampling resistor is electrically connected to the second end of the power supply module, the first end of the first switch is electrically connected to the second end of the current limiting module, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the wiring port submodule is electrically connected to the second end of the current limiting module, the second end of the wiring port submodule is electrically connected to the second end of the power supply module, and the external port module is used to switch to the four-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is closed, and switch to the two-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is disconnected.

[0099] According to an embodiment of the utility model, the probe station is electrically connected to the wiring port submodule and is used to detect the electrical parameters of the Josephson junction constant temperature resistor.

[0100] According to an embodiment of the utility model, the source meter is electrically connected to the wiring port submodule to display the detected electrical parameters of the Josephson junction constant temperature resistor.

[0101] According to an embodiment of the utility model, the power supply module includes a DC source, a first gear shifter and a second switch; wherein, the DC source, the first end of the DC source is electrically connected to the first end of the second switch, the second end of the DC source is electrically connected to the first end of the first gear shifter, and is used to supply power to the Josephson junction constant temperature resistor; the first gear shifter, the first end of the first gear shifter is electrically connected to the second end of the DC source, the second end of the first gear shifter is electrically connected to the current limiting module, and is used to select the supply voltage of the DC source; the second switch, the first end of the second switch is electrically connected to the first end of the DC source, the second end of the second switch is electrically connected to the second end of the external port module, and is used to control the circuit of the multi-gear DC measurement box to be turned on or off.

[0102] According to an embodiment of the utility model, the current limiting module includes a second gear shifter and a current limiting submodule; wherein, the second gear shifter, the first end of the second gear shifter is electrically connected to the second end of the first gear shifter, the second end of the second gear shifter is electrically connected to the first end of the current limiting submodule, and is used to select the current limiting resistor of the current limiting submodule according to the test power of the Josephson junction constant temperature resistor, so as to output a power supply voltage corresponding to the test power to the Josephson junction constant temperature resistor; the current limiting submodule, the first end of the current limiting submodule is electrically connected to the second end of the second gear shifter, the second end of the current limiting submodule is electrically connected to the external port module, and is used to limit the current of the circuit of the multi-speed DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

[0103] According to an embodiment of the utility model, the wiring port submodule includes a first external port, a second external port, a third external port, a fourth external port, a fifth external port, a sixth external port, a fifth switch and a sixth switch; wherein the first external port and the second external port are electrically connected to the source meter; the third external port, the fourth external port, the fifth external port and the sixth external port are electrically connected to the probe station; the fifth switch, the first end of the fifth switch is electrically connected to the fifth external port, and the second end of the fifth switch is electrically connected to the third external port; the sixth switch, the first end of the sixth switch is electrically connected to the fourth external port, and the second end of the sixth switch is electrically connected to the sixth external port.

[0104] Figure 5 The schematic diagram of the multi-speed DC measurement box according to the embodiment of the utility model is schematically shown.

[0105] like Figure 5 As shown, Figure 5 The circuit welding diagram of the multi-speed DC measuring box is shown. The box body of the multi-speed DC measuring box can use a metal box body to improve the shielding of the electrical signal. When using the multi-speed DC measuring box, select the required DC source and current limiting resistor, select the 2 / 4 lead mode, connect the probe station to the third external port and the fourth external port, the fifth external port and the sixth external port of the input end external port, and after the source meter is connected to the first external port and the second external port, the Josephson junction constant temperature resistor can be tested. In the case of probe measurement, some electrical parameters of the Josephson junction constant temperature resistor can be directly read on the source meter.

[0106] Figure 6 A schematic diagram schematically shows a panel design of a multi-speed DC measurement box according to an embodiment of the utility model.

[0107] like Figure 6 As shown, Figure 6 The panel design of the multi-speed DC measurement box is shown, and the panel design of the multi-speed DC measurement box only includes switches and external ports.

[0108] Figure 7 The schematic diagram schematically shows the appearance of a multi-speed DC measurement box according to an embodiment of the utility model.

[0109] like Figure 7 As shown, Figure 7 The figure shows the appearance of the multi-speed DC measurement box. The multi-speed DC measurement box uses a metal box to increase the shielding of electrical signals. There are 4 knobs in the figure, 4 of which are selection switches, and the rest are external ports. When in use, select the required DC source and current limiting resistor, select 2 or 4 lead mode, connect the probe station to the input external port (I / V), and connect the source meter to the output (M). When measuring with the probe, the electrical parameters can be read on the source meter.

[0110] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

[0111] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present invention is defined by the attached claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A multi-speed DC measurement box, applied in the field of superconducting quantum computing, characterized in that: The multi-speed DC measurement box includes: a power supply module, a current limiting module and an external port module; wherein, The power supply module is used to supply power to the Josephson junction constant temperature resistor; The current limiting module, wherein the first end of the current limiting module is electrically connected to the first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor; The external port module includes a sampling resistor, a first switch and a wiring port submodule, wherein the first end of the sampling resistor is electrically connected to the second end of the current limiting module, the second end of the sampling resistor is electrically connected to the second end of the power supply module, the first end of the first switch is electrically connected to the second end of the current limiting module, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the wiring port submodule is electrically connected to the second end of the current limiting module, and the second end of the wiring port submodule is electrically connected to the second end of the power supply module. The external port module is used to switch to a four-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is closed, and switch to a two-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is disconnected. The wiring port submodule is electrically connected to a probe station and a source meter so as to test the electrical parameters of the Josephson junction constant temperature resistor through the probe of the probe station.

2. The multi-position DC measuring box according to claim 1, characterized in that: The power supply module includes a DC source, a first gear shifter and a second switch; wherein, The DC source, a first end of the DC source is electrically connected to a first end of the second switch, and a second end of the DC source is electrically connected to a first end of the first gear shifter, for supplying power to the Josephson junction constant temperature resistor; The first gear shifter, wherein the first end of the first gear shifter is electrically connected to the second end of the DC source, and the second end of the first gear shifter is electrically connected to the current limiting module, and is used to select the supply voltage of the DC source; The second switch, wherein the first end of the second switch is electrically connected to the first end of the DC source, and the second end of the second switch is electrically connected to the second end of the external port module, is used to control the circuit of the multi-speed DC measurement box to be turned on or off.

3. The multi-position DC measuring box according to claim 2, characterized in that: The DC source includes a first power source, a third switch, a second power source and a fourth switch; wherein, The first power supply, a first end of the first power supply is electrically connected to a first end of the second switch, and a second end of the first power supply is electrically connected to a first end of the third switch; The third switch, wherein a first end of the third switch is electrically connected to a second end of the first power source, and a second end of the third switch is electrically connected to a first end of the first gear shifter; The second power supply, a first end of the second power supply is electrically connected to a first end of the second switch, and a second end of the second power supply is electrically connected to a first end of the fourth switch; The fourth switch, a first end of the fourth switch is electrically connected to the second end of the second power supply, and a second end of the fourth switch is electrically connected to the first end of the first gear shifter.

4. The multi-position DC measuring box according to claim 1, characterized in that: The current limiting module includes a second gear and a current limiting submodule; wherein, The second gear shifter, wherein the first end of the second gear shifter is electrically connected to the second end of the first gear shifter, and the second end of the second gear shifter is electrically connected to the first end of the current limiting submodule, and is used to select the current limiting resistor of the current limiting submodule according to the test power of the Josephson junction constant temperature resistor, so as to output a supply voltage corresponding to the test power to the Josephson junction constant temperature resistor; The current limiting submodule, the first end of which is electrically connected to the second end of the second gear, and the second end of which is electrically connected to the external port module, is used to limit the current of the circuit of the multi-gear DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

5. The multi-position DC measuring box according to claim 4, characterized in that: The current limiting submodule includes a first resistor and a second resistor; in; The first resistor, a first end of the first resistor is electrically connected to the second end of the second gear shifter, and a second end of the first resistor is electrically connected to the external port module; The second resistor, a first end of the second resistor is electrically connected to a second end of the second gear shifter, and a second end of the second resistor is electrically connected to the external port module.

6. The multi-position DC measuring box according to claim 1, characterized in that: The connection port submodule includes a first external port, a second external port, a third external port, a fourth external port, a fifth external port, a sixth external port, a fifth switch and a sixth switch; wherein, The first external port and the second external port are electrically connected to the source meter; The third external port, the fourth external port, the fifth external port and the sixth external port are electrically connected to the probe station; the fifth switch, wherein a first end of the fifth switch is electrically connected to the fifth external port, and a second end of the fifth switch is electrically connected to the third external port; The sixth switch has a first end electrically connected to the fourth external port, and a second end electrically connected to the sixth external port.

7. A multi-level DC measurement system, applied in the field of superconducting quantum computing, characterized in that: The multi-speed DC measurement system includes: a multi-speed DC measurement box, a probe station and a source meter, wherein the multi-speed DC measurement box includes: a power supply module, a current limiting module and an external port module; wherein, The power supply module is used to supply power to the Josephson junction constant temperature resistor; The current limiting module, wherein the first end of the current limiting module is electrically connected to the first end of the power supply module, and is used to control the test power supplied by the power supply module to the Josephson junction constant temperature resistor; The external port module comprises a sampling resistor, a first switch and a wiring port submodule, wherein the first end of the sampling resistor is electrically connected to the second end of the current limiting module, the second end of the sampling resistor is electrically connected to the second end of the power supply module, the first end of the first switch is electrically connected to the second end of the current limiting module, the second end of the first switch is electrically connected to the second end of the current limiting module, the first end of the wiring port submodule is electrically connected to the second end of the current limiting module, the second end of the wiring port submodule is electrically connected to the second end of the power supply module, and the external port module is used to switch to a four-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is closed, and switch to a two-lead method test mode to detect the Josephson junction constant temperature resistor when the first switch is disconnected; The probe station is electrically connected to the wiring port submodule and is used to detect electrical parameters of the Josephson junction constant temperature resistor; The source meter is electrically connected to the connection port submodule and is used to display the detected electrical parameters of the Josephson junction constant temperature resistor.

8. The system according to claim 7, characterized in that The power supply module includes a DC source, a first gear shifter and a second switch; wherein, The DC source, a first end of the DC source is electrically connected to a first end of the second switch, and a second end of the DC source is electrically connected to a first end of the first gear shifter, for supplying power to the Josephson junction constant temperature resistor; The first gear shifter, wherein the first end of the first gear shifter is electrically connected to the second end of the DC source, and the second end of the first gear shifter is electrically connected to the current limiting module, and is used to select the supply voltage of the DC source; The second switch, wherein the first end of the second switch is electrically connected to the first end of the DC source, and the second end of the second switch is electrically connected to the second end of the external port module, is used to control the circuit of the multi-speed DC measurement box to be turned on or off.

9. The system according to claim 7, characterized in that The current limiting module includes a second gear and a current limiting submodule; wherein, The second gear shifter, wherein the first end of the second gear shifter is electrically connected to the second end of the first gear shifter, and the second end of the second gear shifter is electrically connected to the first end of the current limiting submodule, and is used to select the current limiting resistor of the current limiting submodule according to the test power of the Josephson junction constant temperature resistor, so as to output a supply voltage corresponding to the test power to the Josephson junction constant temperature resistor; The current limiting submodule, the first end of which is electrically connected to the second end of the second gear, and the second end of which is electrically connected to the external port module, is used to limit the current of the circuit of the multi-gear DC measurement box to control the test power output to the Josephson junction constant temperature resistor.

10. The system according to claim 7, characterized in that The connection port submodule includes a first external port, a second external port, a third external port, a fourth external port, a fifth external port, a sixth external port, a fifth switch and a sixth switch; wherein, The first external port and the second external port are electrically connected to the source meter; The third external port, the fourth external port, the fifth external port and the sixth external port are electrically connected to the probe station; the fifth switch, wherein a first end of the fifth switch is electrically connected to the fifth external port, and a second end of the fifth switch is electrically connected to the third external port; The sixth switch has a first end electrically connected to the fourth external port, and a second end electrically connected to the sixth external port.

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