Impedance distortion measurement method and device of quantum signal link and electronic equipment

Abstract

The invention discloses an impedance distortion measurement method for a quantum signal link, and belongs to the field of quantum. The method comprises the following steps: for a quantum signal link which is sequentially connected with a signal source, an attenuator and a quantum processor through transmission lines, applying a detection signal by taking one end point of each transmission line as a detection point so as to obtain a corresponding relationship between impedance corresponding to each transmission line and the duration of the detection signal, and according to the corresponding relation of each transmission line and the detection point position, directly determining the impedance distortion position of each transmission line, and generating impedance distortion information of the quantum signal link. According to the invention, the measurement efficiency of the impedance distortion of the quantum signal link can be effectively improved.

Description

Technical Field

[0001] This application belongs to the field of quantum, and particularly relates to a method, device and electronic device for measuring impedance distortion of a quantum signal link. Background Art

[0002] Quantum computing is a new computing mode that regulates basic information units according to the laws of quantum mechanics for computing. The basic information unit of classical computing is a classical bit, and the basic information unit of quantum computing is a quantum bit. A classical bit can only be in one state, that is, 0 or 1. Based on the principle of superposition of quantum mechanical states, the state of a quantum bit can be in a superposition state of multiple possibilities. Therefore, the computing efficiency of quantum computing far exceeds that of classical computing.

[0003] In a quantum computer of a superconducting physical system, a quantum processor usually operates in an extremely low-temperature environment. Various control signals are output by a quantum computing measurement and control system and output to the quantum processor through a quantum signal link. Each quantum bit on the quantum processor is electrically connected to a quantum state regulation control line, and is connected to the quantum signal link through the quantum state regulation control line of the quantum bit to receive control signals. The quantum processor is generally integrated in the millikelvin temperature range inside a refrigeration device, while the quantum computing measurement and control system is generally integrated in the room-temperature environment outside the refrigeration device. The quantum computing measurement and control system and the quantum processor are connected through a quantum signal link.

[0004] When there is impedance distortion on the quantum signal link, the control signals transmitted on the quantum signal link will be distorted, directly affecting the control effect on the quantum bit and reducing the fidelity of the control signals. The existing technology for measuring impedance distortion of a quantum signal link determines the distortion degree of the control signal by performing a Rabi experiment on the quantum bit and comparing the loss and distortion degree of the experimental results. This requires first calibrating the relevant information of the quantum bit and requires the performance of the quantum bit to be good enough; moreover, calibrating the quantum bit takes a lot of time and is time-consuming and laborious.

[0005] Therefore, how to improve the efficiency of measuring impedance distortion of a quantum bit signal link has become an urgent technical problem in this field. Summary of the Invention

[0006] The purpose of this application is to provide a method, device and electronic device for measuring impedance distortion of a quantum signal link, which makes up for the shortcomings of the existing method for measuring impedance distortion of a quantum signal link being relatively cumbersome and time-consuming, and improves the measurement efficiency of impedance distortion of a quantum signal link.

[0007] The technical solution of this application is as follows:

[0008] In a first aspect, an example of the present application provides a method for measuring impedance distortion of a quantum signal link, where the quantum signal link includes a signal source and a quantum processor connected in series, and a plurality of attenuators connected in series through transmission lines are arranged between the signal source and the quantum processor. The method includes:

[0009] For each of the transmission lines, select one end point of the transmission line as a detection point;

[0010] Apply a detection signal to the detection point of each transmission line within a preset time duration, receive a reflected signal at the detection point, and obtain the corresponding relationship between the impedance of each transmission line and the preset time duration;

[0011] Determine the impedance distortion information of the quantum signal link according to the corresponding relationship of each transmission line and the position of the detection point.

[0012] According to some examples of the present application, for each of the transmission lines, selecting one end point of the transmission line as a detection point includes:

[0013] For the transmission line connecting the signal source and the attenuator, select the end point of the transmission line connecting the signal source as the detection point;

[0014] For the transmission line connecting the quantum processor and the attenuator, select the end point of the transmission line connecting the attenuator as the detection point;

[0015] For the transmission line connecting two of the attenuators, select the end point of the transmission line close to the quantum processor as the detection point.

[0016] According to some examples of the present application, before applying the detection signal to the detection point of the transmission line, the method further includes:

[0017] Interrupt the connection of the detection point.

[0018] According to some examples of the present application, determining the impedance distortion information of the quantum signal link according to the corresponding relationship of each transmission line and the position of the detection point includes:

[0019] For each of the transmission lines, determine whether there is impedance distortion in the transmission line according to the corresponding relationship of the transmission line;

[0020] When it is determined that there is impedance distortion, determine the impedance distortion position of the transmission line according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line.

[0021] According to some examples of the present application, determining the impedance distortion position of the transmission line according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line includes:

[0022] Determining a target measurement time corresponding to an impedance value outside a preset range in the corresponding relationship of the transmission line;

[0023] According to the target measurement time and the transmission speed of the detection signal, determining the distance of the impedance distortion position relative to the detection point;

[0024] According to the distance and the position of the detection point, determining the impedance distortion position.

[0025] According to some examples of the present application, the detection signal is applied by a time domain reflectometer or a vector network analyzer.

[0026] According to some examples of the present application, applying a detection signal to the detection point of each transmission line within a preset duration, receiving a reflection signal at the detection point, and obtaining the corresponding relationship between the impedance of each transmission line and the preset duration includes:

[0027] For each transmission line, within the preset duration, applying the detection signal to the detection point;

[0028] Receiving the reflection signal at the detection point;

[0029] Based on the preset duration, performing a time domain conversion process on the reflection signal to obtain the corresponding relationship characterizing the impedance of the transmission line changing with time domain.

[0030] In a second aspect, some examples of the present application propose an impedance distortion measurement device for a quantum signal link. The quantum signal link includes a signal source and a quantum processor connected in series. A plurality of attenuators connected in series through transmission lines are arranged between the signal source and the quantum processor. The device includes:

[0031] A detection point determination module, configured to select an end point of each transmission line as a detection point;

[0032] A corresponding relationship acquisition module, configured to apply a detection signal to the detection point of each transmission line within a preset duration, receive a reflection signal at the detection point, and obtain the corresponding relationship between the impedance of each transmission line and the preset duration;

[0033] An impedance distortion information determination module, configured to determine the impedance distortion information of the quantum signal link according to the corresponding relationship of each transmission line and the position of the detection point.

[0034] According to some examples of the present application, the detection point determination module is specifically configured to:

[0035] For the transmission line connecting the signal source and the attenuator, select the end point of the transmission line connecting the signal source as the detection point;

[0036] For the transmission line connecting the quantum processor and the attenuator, select the end point of the transmission line connecting the attenuator as the detection point;

[0037] For the transmission line connecting two of the attenuators, select the end point of the transmission line close to the quantum processor as the detection point.

[0038] According to some examples of the present application, the impedance distortion measurement device for the quantum signal link further includes:

[0039] An interruption module, configured to interrupt the connection of the detection point.

[0040] According to some examples of the present application, the impedance distortion information determination module is specifically configured to:

[0041] For each of the transmission lines, determine whether there is impedance distortion in the transmission line according to the corresponding relationship of the transmission line;

[0042] When it is determined that there is impedance distortion, determine the impedance distortion position of the transmission line according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line.

[0043] According to some examples of the present application, the impedance distortion information determination module is specifically configured to:

[0044] Determine the target measurement time corresponding to the impedance value outside the preset range in the corresponding relationship of the transmission line;

[0045] According to the target measurement time and the transmission speed of the detection signal, determine the distance of the impedance distortion position relative to the detection point;

[0046] According to the distance and the position of the detection point, determine the impedance distortion position.

[0047] According to some examples of the present application, the impedance distortion measurement device for the quantum signal link further includes a time domain reflectometer or a vector network analyzer for applying the detection signal.

[0048] According to some examples of the present application, the corresponding relationship acquisition module is specifically configured to:

[0049] For each of the transmission lines, apply the detection signal to the detection point within the preset duration;

[0050] Receive the reflected signal at the detection point;

[0051] Based on the preset duration, perform time-domain conversion processing on the reflected signal to obtain the corresponding relationship characterizing the impedance of the transmission line varying with time domain.

[0052] In a third aspect, an example of the present application provides an electronic device, including: a processor;

[0053] A memory for storing instructions executable by the processor;

[0054] Wherein, the processor realizes the impedance distortion measurement method of the quantum signal link described in the first aspect above by running the executable instructions.

[0055] In a fourth aspect, an example of the present application provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method described in the first aspect above is realized.

[0056] Compared with the prior art, the present application has the following beneficial effects:

[0057] The present application measures the quantum signal link established in the quantum computer. For the quantum signal link that sequentially connects a signal source, an attenuator, and a quantum processor through transmission lines, one endpoint of each transmission line is used as a detection point, and a detection signal is applied to obtain the corresponding relationship between the impedance of each transmission line and the duration of the detection signal. Then, according to the corresponding relationship of each transmission line and the position of the detection point, the impedance distortion position is directly determined, and the impedance distortion information of the quantum signal link is generated. Compared with the prior art that uses qubits to perform Rabi experiments to measure the distortion of the quantum signal link, it saves time and effort and improves the measurement efficiency of impedance distortion. Description of the Drawings

[0058] For a clearer illustration, the following will briefly introduce the drawings required for the description.

[0059] Figure 1 It is a flowchart of the impedance distortion measurement method of the quantum signal link in an example of the present application;

[0060] Figure 2 It is a structural diagram of the quantum signal link in an example of the present application;

[0061] Figure 3 It is a flowchart of the impedance distortion measurement method of the quantum signal link in another example of the present application;

[0062] Figure 4 It is a schematic curve diagram of the corresponding relationship between the impedance of the transmission line of the quantum signal link and the preset duration in an example of the present application;

[0063] Figure 5 It is a structural block diagram of an impedance distortion measurement device for a quantum signal link in an example of this application;

[0064] Figure 6 It is a structural block diagram of an electronic device in an example of this application. Specific embodiments

[0065] The specific embodiments of the present invention will be described in more detail below in conjunction with the schematic diagrams. According to the following description and claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention.

[0066] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0067] In a quantum computing system, the inside of a dilution refrigerator has a complex circuit structure. Therefore, during the installation of the circuit, there is a change in the impedance of the circuit due to the connection operation, and the impedance of the signal transmission line directly affects the microwave signal it transmits. When there is impedance distortion in the line, the microwave signal will be reflected, causing the transmitted microwave signal to be distorted. Therefore, for the measurement and control circuit in a quantum computer, directly measuring the impedance of the transmission line without connecting an attenuator or a signal source or a quantum processor in a room temperature environment will result in certain errors in the obtained impedance distortion results.

[0068] Based on this, as Figure 1 shown, an embodiment of the present invention provides a method for measuring impedance distortion of a quantum signal link. This embodiment is exemplified by the method being applied to a terminal (which can be called a management terminal). The quantum signal link includes a signal source and a quantum processor connected in series, and a plurality of attenuators connected in series through a transmission line are arranged between the signal source and the quantum processor. The method includes:

[0069] S101, for each transmission line, select an end point of the transmission line as a detection point.

[0070] Specifically, the terminal can select any end of the transmission line as the detection point. This application does not make specific limitations on the selection of the detection point, and it can be selected according to actual needs.

[0071] It should be noted that the detection points can be selected according to the actual difficulty of connecting the quantum signal link, and the technical solution with the least number of times of disassembling and assembling the transmission line and the easiest disassembly and assembly is used as the optimal technical solution for detecting the impedance distortion of the quantum signal link, so as to improve the accuracy of impedance distortion detection. In the quantum signal link, the signal source, the attenuator and the quantum processor are connected in sequence through the transmission line, and the number of attenuators and the number of transmission lines in this application are not limited.

[0072] S102, Apply a detection signal to the detection point of each transmission line within a preset time period, receive the reflected signal at the detection point, and obtain the corresponding relationship between the impedance of each transmission line and the preset time period.

[0073] Among them, the preset time period is the time for receiving the reflected signal.

[0074] For each transmission line, the terminal can determine the transmission time period for the detection signal to pass through this transmission line according to the known transmission speed of the detection signal in the transmission line and the length of the transmission line. Furthermore, the terminal can determine the preset time period of this transmission line according to the transmission time period of this transmission line. For each transmission line, the preset time period of this transmission line should be greater than twice the transmission time period of this transmission line to ensure that the detection signal passes through the entire transmission line and can be reflected back to the detection point after encountering the impedance distortion position.

[0075] At least one end of each transmission line is connected to the attenuator. When one end of a transmission line is the detection point and the other end is connected to the attenuator, after the detection signal passes through this transmission line and then passes through the attenuator, the terminal can detect the connection state between this transmission line and the attenuator according to the obtained corresponding relationship between the impedance and the preset time period: The terminal takes twice the transmission time period of this transmission line as the detection time point, and queries whether the impedance value corresponding to the detection time point is in the impedance distortion state according to the detection time point in the corresponding relationship between the impedance and the preset time period; if there is impedance distortion, it is determined that there is an abnormal connection between the transmission line and the attenuator, and further connection detection is required; if there is no impedance distortion, it is determined that the connection between the transmission line and the attenuator is normal.

[0076] Specifically, for each transmission line, based on the TDR test, the terminal applies a detection signal to the detection point, and the detection signal passes through the transmission line. When there is impedance distortion in the transmission line, the detection signal will generate a reflection, and the terminal can receive the reflected signal at the detection point, and then determine the curve information of the impedance changing with time (that is, the corresponding relationship between the impedance and the preset time period).

[0077] S103, Determine the impedance distortion information of the quantum signal link according to the corresponding relationship of each transmission line and the position of the detection point.

[0078] Among them, for each transmission line, the terminal can directly determine whether the transmission line is distorted according to the corresponding relationship of the transmission line. When distortion exists, the impedance distortion position of the transmission line is determined according to the corresponding relationship of the transmission line and the position of the detection point.

[0079] Specifically, the terminal sequentially detects each transmission line along the direction from the signal source to the quantum processor: the terminal directly determines whether there is impedance distortion in the transmission line according to the corresponding relationship of the transmission line; if there is impedance distortion, the impedance distortion position of the transmission line is determined based on the corresponding relationship of the transmission line and the position of the detection point of the transmission line; if there is no impedance distortion in the transmission line, the adjacent transmission line is detected; until all transmission lines are detected, the terminal can generate impedance distortion information of the quantum signal link according to the detected impedance distortion position.

[0080] In a method for measuring impedance distortion of a quantum signal link proposed in this application, for a quantum signal link that sequentially connects a signal source, an attenuator, and a quantum processor through transmission lines, one end point of each transmission line is used as a detection point, and a detection signal is applied to obtain the corresponding relationship between the impedance corresponding to each transmission line and the duration of the detection signal, and the impedance distortion position is directly determined according to the corresponding relationship of each transmission line and the position of the detection point, and impedance distortion information of the quantum signal link is generated. Compared with the prior art, using qubits to perform Rabi experiments to measure the distortion of the quantum signal link saves time and effort and improves the measurement efficiency of impedance distortion.

[0081] In an embodiment of the present application, in the above step S101, for each transmission line, selecting one end point of the transmission line as a detection point includes:

[0082] For the transmission line connecting the signal source and the attenuator, select the end point of the transmission line connecting the signal source as the detection point;

[0083] For the transmission line connecting the quantum processor and the attenuator, select the end point of the transmission line connecting the attenuator as the detection point;

[0084] For the transmission line connecting two attenuators, select the end point of the transmission line close to the quantum processor as the detection point.

[0085] To Figure 2For illustration purposes, the first transmission line 21 is respectively connected to a signal source (not shown in the figure) and the first attenuator 11, the second transmission line 22 is respectively connected to the first attenuator 11 and the second attenuator 12, and the third transmission line 23 is respectively connected to the second attenuator 12 and the quantum processor 3. For the transmission line connecting the signal source and the attenuator, that is, the first transmission line 21, select the end point where the first transmission line 21 is connected to the signal source as the detection point, and apply a detection signal transmitted along the direction from the first transmission line 21 to the second transmission line 22; for the transmission line connecting the quantum processor and the attenuator, that is, the third transmission line 23, select the end point of the third transmission line 23 close to the quantum processor 3 as the detection point, and apply a detection signal transmitted along the direction from the third transmission line 23 to the second transmission line 22; for the transmission line connecting the two attenuators, that is, the second transmission line 22, select the end point of the second transmission line 22 close to the quantum processor 3 as the detection point, and apply a detection signal transmitted along the direction from the second transmission line 22 to the first transmission line 21.

[0086] It should be noted that the detection point can be selected according to the actual difficulty of connecting the quantum signal link.

[0087] In an embodiment of the present application, before applying the detection signal to the detection point of the transmission line in the above step S102, the method further includes:

[0088] Interrupt the connection of the detection point.

[0089] It should be noted that the terminal can select the detection point according to the actual difficulty of connecting the quantum signal link, and use the technical solution with the fewest number of interrupted detection points and the easiest disassembly and assembly as the optimal technical solution for impedance distortion detection of the quantum signal link, so as to improve the accuracy of impedance distortion detection.

[0090] Take Figure 2 For illustration purposes, when detecting the first transmission line 21 and using the end point where the first transmission line 21 is connected to the signal source as the detection point, interrupt the connection between the first transmission line 21 and the signal source, and apply a detection signal transmitted along the direction from the first transmission line 21 to the second transmission line 22 at the detection point; when detecting the third transmission line 23 and using the end point of the third transmission line 23 close to the quantum processor 3 as the detection point, interrupt the connection between the third transmission line 23 and the quantum processor 3, and apply a detection signal transmitted along the direction from the third transmission line 23 to the second transmission line 22 at the detection point; when detecting the second transmission line 22 and using the end point of the second transmission line 22 close to the quantum processor 3 as the detection point, interrupt the connection between the second transmission line 22 and the attenuator close to the quantum processor 3 (i.e., the second attenuator 12), and apply a detection signal transmitted along the direction from the second transmission line 22 to the first transmission line 21 at the detection point.

[0091] In an embodiment of the present application, asFigure 3 As shown in Figure 3 , in the above step S103, according to the corresponding relationship of each transmission line and the position of the detection point, the impedance distortion information of the quantum signal link is determined, including:

[0092] S301. For each transmission line, according to the corresponding relationship of the transmission line, determine whether there is impedance distortion in the transmission line.

[0093] As shown in the appendix Figure 4 As shown in Figure 4 , it is a schematic curve diagram of the corresponding relationship between the impedance of the transmission line of the quantum signal link and the preset duration. In the figure, the horizontal axis of the coordinate is the measurement time, and the vertical axis of the coordinate is the impedance. The impedance in the figure changes with the duration of the detection signal. The transmission speed of the test signal in the quantum signal link is fixed and known. Therefore, the duration of the detection signal and the test position of the signal link are in one-to-one correspondence. Based on this, the terminal can determine the corresponding measurement position according to the duration of the detection signal, that is, the impedance corresponding to each position of the transmission line, and then determine whether the impedance of the transmission line has distorted.

[0094] S302. When it is determined that there is impedance distortion, according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line, determine the impedance distortion position of the transmission line.

[0095] Specifically, when the terminal determines that there is impedance distortion in the transmission line, the position of the distortion point directly determined through the corresponding relationship relative to the detection point. Therefore, the terminal also needs to determine the position of the impedance distortion of the transmission line in the entire quantum signal link according to the position of the detection point of the transmission line.

[0096] In an embodiment of the present application, in the above step S302, according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line, determining the impedance distortion position of the transmission line includes:

[0097] Determine the target measurement time corresponding to the impedance value outside the preset range in the corresponding relationship of the transmission line;

[0098] According to the target measurement time and the transmission speed of the detection signal, determine the distance of the impedance distortion position relative to the detection point;

[0099] According to the distance and the position of the detection point, determine the impedance distortion position.

[0100] Among them, the terminal stores a preset range of impedance values. When it is detected that the impedance value is outside the preset range, it is determined that there is impedance distortion in the transmission line. Specifically, the terminal determines the target detection time corresponding to the impedance value outside the preset range according to the obtained correspondence between the transmission line impedance and the preset duration. After the detection signal is applied at the detection point, the transmission reaches the position of the impedance distortion point at the target detection time. Therefore, the terminal can determine the distance of the impedance distortion point relative to the detection point according to the transmission speed of the detection signal and the target detection time. Finally, the terminal can determine the impedance distortion position of the impedance distortion point in the entire quantum signal link according to the relative position of the impedance distortion point and the position of the detection point.

[0101] In an embodiment of the present application, the detection signal is applied through a time domain reflectometer or a vector network analyzer.

[0102] Specifically, for each transmission line, the terminal can apply a detection signal to the detection point of the transmission line through the single-port test mode of a time domain reflectometer or a vector network analyzer, and collect the reflected signal reflected and output at the detection point through the time domain reflectometer or the vector network analyzer, and obtain the correspondence between the impedance of the transmission line and the preset duration through the reflected signal.

[0103] In an embodiment of the present application, the above step S102 of applying a detection signal to the detection point of each transmission line within a preset duration, receiving the reflected signal at the detection point, and obtaining the correspondence between the impedance of each transmission line and the preset duration includes:

[0104] For each transmission line, within the preset duration, apply a detection signal to the detection point;

[0105] Receive the reflected signal at the detection point;

[0106] Based on the preset duration, perform time domain conversion processing on the reflected signal to obtain the correspondence relationship representing the impedance of the transmission line changing with time domain.

[0107] Specifically, for each transmission line, the terminal can apply a detection signal to the detection point of the transmission line through a time domain reflectometer or a vector network analyzer, collect the reflected signal reflected and output at the detection point, and also perform time domain conversion processing on the received reflected signal through the time domain reflectometer or the vector network analyzer to obtain time domain impedance data and intuitively display the impedance value.

[0108] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0109] Based on the same inventive concept, an embodiment of the present application also provides an impedance distortion measurement device for a quantum signal link for implementing the impedance distortion measurement method of the quantum signal link involved above. The implementation solutions provided by this device to solve problems are similar to the implementation solutions described in the above method. Therefore, the specific limitations in one or more embodiments of the impedance distortion measurement device for a quantum signal link provided below can refer to the limitations on the impedance distortion measurement method of the quantum signal link in the above text, and will not be repeated here.

[0110] As Figure 5 shown, in an embodiment of the present application, an impedance distortion measurement device 500 for a quantum signal link is provided. The quantum signal link includes a signal source and a quantum processor connected in series, and a plurality of attenuators connected in series through a transmission line are arranged between the signal source and the quantum processor. The device includes:

[0111] A detection point determination module 510, configured to select an end point of the transmission line as a detection point for each transmission line;

[0112] A correspondence relationship acquisition module 520, configured to apply a detection signal to the detection point of each transmission line within a preset time period, receive a reflected signal at the detection point, and obtain the correspondence relationship between the impedance of each transmission line and the preset time period;

[0113] An impedance distortion information determination module 530, configured to determine the impedance distortion information of the quantum signal link according to the correspondence relationship of each transmission line and the position of the detection point.

[0114] In an embodiment of the present application, the detection point determination module 510 is specifically configured to:

[0115] For the transmission line connecting the signal source and the attenuator, select the end point of the transmission line connecting the signal source as the detection point;

[0116] For the transmission line connecting the quantum processor and the attenuator, select the end point of the transmission line connecting the attenuator as the detection point;

[0117] For the transmission line connecting two attenuators, select the end point of the transmission line close to the quantum processor as the detection point.

[0118] In an embodiment of the present application, the impedance distortion measurement device 500 of the quantum signal link further includes:

[0119] An interruption module, configured to interrupt the connection of the detection point.

[0120] In an embodiment of the present application, the impedance distortion information determination module 530 is specifically configured to:

[0121] For each transmission line, determine whether there is impedance distortion according to the corresponding relationship of the transmission line;

[0122] When it is determined that there is impedance distortion, determine the impedance distortion position of the transmission line according to the corresponding relationship of the transmission line and the position of the detection point of the transmission line.

[0123] In an embodiment of the present application, the impedance distortion information determination module 530 is specifically configured to:

[0124] Determine the target measurement time corresponding to the impedance value outside the preset range in the corresponding relationship of the transmission line;

[0125] According to the target measurement time and the transmission speed of the detection signal, determine the distance of the impedance distortion position relative to the detection point;

[0126] According to the distance and the position of the detection point, determine the impedance distortion position.

[0127] In an embodiment of the present application, the impedance distortion measurement device 500 of the quantum signal link further includes a time domain reflectometer or a vector network analyzer for applying a detection signal.

[0128] In an embodiment of the present application, the corresponding relationship acquisition module 520 is specifically configured to:

[0129] For each transmission line, apply a detection signal to the detection point within a preset time period;

[0130] Receive a reflected signal at the detection point;

[0131] Based on the preset time period, perform time domain conversion processing on the reflected signal to obtain a corresponding relationship characterizing the impedance of the transmission line changing with time domain.

[0132] Based on the same inventive concept, as Figure 6 shown, an embodiment of the present invention further provides an electronic device, including:

[0133] A processor;

[0134] A memory for storing processor-executable instructions;

[0135] Wherein, the processor implements the impedance distortion measurement method of the quantum signal link in any one of the above feature descriptions by running the executable instructions.

[0136] Based on the same inventive concept, an embodiment of the present invention also proposes a readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it can implement the impedance distortion measurement method of the quantum signal link in any one of the above feature descriptions.

[0137] A readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. For example, it can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device, such as a punched card or raised structures in grooves storing instructions thereon, and any suitable combination of the above. The computer programs described herein can be downloaded from the readable storage medium to various computing / processing devices, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter or network interface in each computing / processing device receives the computer program from the network and forwards the computer program for storage in the readable storage medium in each computing / processing device. The computer program for performing the operations of the present invention can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages. The programming languages include object-oriented programming languages - such as Smalltalk, C++, etc., and conventional procedural programming languages - such as the "C" language or similar programming languages. The computer program can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer program to customize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute computer-readable program instructions to implement various aspects of the present invention.

[0138] Aspects of the present invention are described herein with reference to the flowcharts and / or block diagrams of methods, systems, and computer program products according to embodiments of the present invention. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer programs. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, thereby producing a machine such that the programs, when executed by the processor of the computer or other programmable data processing apparatus, generate means for implementing the functions / actions specified in one or more blocks of the flowcharts and / or block diagrams. These computer programs can also be stored in a readable storage medium, which causes a computer, a programmable data processing apparatus, and / or other devices to operate in a specific manner, so that the readable storage medium storing the computer programs includes a manufacture, which includes instructions for implementing various aspects of the functions / actions specified in one or more blocks of the flowcharts and / or block diagrams.

[0139] The computer programs can also be loaded onto a computer, other programmable data processing apparatus, or other devices, such that a series of operation steps are executed on the computer, other programmable data processing apparatus, or other devices to produce a computer-implemented process, so that the computer programs executed on the computer, other programmable data processing apparatus, or other devices implement the functions / actions specified in one or more blocks of the flowcharts and / or block diagrams.

[0140] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", or "specific example" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0141] The above are only the preferred embodiments of the present invention and do not impose any limitation on the present invention. Any person skilled in the art within the technical field of the present invention, without departing from the technical solutions of the present invention, makes any form of equivalent replacement or modification and other changes to the technical solutions and technical content disclosed in the present invention, all of which are within the content of the technical solutions of the present invention and still fall within the protection scope of the present invention.

Claims

1. A method for measuring impedance distortion of a quantum signal link, characterized in that The quantum signal link includes a signal source and a quantum processor connected in series, and a plurality of attenuators connected in series through transmission lines are arranged between the signal source and the quantum processor. The method includes: For each of the transmission lines, select an end point of the transmission line as a detection point; Apply a detection signal to the detection point of each transmission line within a preset time period, receive a reflected signal at the detection point, and obtain the correspondence between the impedance of each transmission line and the preset time period; Determine the impedance distortion information of the quantum signal link according to the correspondence of each transmission line and the position of the detection point.

2. The impedance distortion measurement method of the quantum signal link according to claim 1, characterized in that The step of, for each of the transmission lines, selecting an end point of the transmission line as a detection point includes: For the transmission line connecting the signal source and the attenuator, select the end point of the transmission line connecting the signal source as the detection point; For the transmission line connecting the quantum processor and the attenuator, select the end point of the transmission line connecting the attenuator as the detection point; For the transmission line connecting two attenuators, select the end point of the transmission line close to the quantum processor as the detection point.

3. The impedance distortion measurement method of the quantum signal link according to claim 1, wherein Before applying the detection signal to the detection point of the transmission line, the method further includes: Interrupt the connection of the detection point.

4. The impedance distortion measurement method of the quantum signal link according to claim 1, characterized in that The step of determining the impedance distortion information of the quantum signal link according to the correspondence of each transmission line and the position of the detection point includes: For each of the transmission lines, determine whether there is impedance distortion according to the correspondence of the transmission line; When it is determined that there is impedance distortion, determine the impedance distortion position of the transmission line according to the correspondence of the transmission line and the position of the detection point of the transmission line.

5. The impedance distortion measurement method of the quantum signal link according to claim 4, characterized in that, The step of determining the impedance distortion position of the transmission line according to the correspondence of the transmission line and the position of the detection point of the transmission line includes: Determine the target measurement time corresponding to the impedance value outside the preset range in the correspondence of the transmission line; According to the target measurement time and the transmission speed of the detection signal, determine the distance of the impedance distortion position relative to the detection point; Determine the impedance distortion position according to the distance and the position of the detection point.

6. The impedance distortion measurement method of the quantum signal link according to claim 1, wherein The detection signal is applied by a time domain reflectometer or a vector network analyzer.

7. The impedance distortion measurement method of the quantum signal link according to claim 1, characterized in that The step of applying a detection signal to the detection point of each transmission line within a preset time period, receiving a reflected signal at the detection point, and obtaining the correspondence between the impedance of each transmission line and the preset time period includes: For each of the transmission lines, apply the detection signal to the detection point within the preset time period; Receive the reflected signal at the detection point; Based on the preset time period, perform time domain conversion processing on the reflected signal to obtain the correspondence characterizing the impedance of the transmission line changing with time domain.

8. An impedance distortion measurement device for a quantum signal link, characterized in that, The quantum signal link includes a signal source and a quantum processor connected in series, and a plurality of attenuators connected in series through transmission lines are arranged between the signal source and the quantum processor. The device includes: A detection point determination module, configured to, for each of the transmission lines, select an end point of the transmission line as a detection point; A corresponding relationship acquisition module, configured to apply a detection signal to a detection point of each of the transmission lines within a preset duration, receive a reflected signal at the detection point, and obtain a corresponding relationship between the impedance of each of the transmission lines and the preset duration; An impedance distortion information determination module, configured to determine impedance distortion information of the quantum signal link according to the corresponding relationship of each of the transmission lines and the position of the detection point.

9. An electronic device, comprising: A processor; A memory for storing instructions executable by the processor; Wherein, the processor implements the method according to any one of claims 1-7 by running the executable instructions.

10. A computer-readable storage medium, characterized in that, A computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the method according to any one of claims 1-7 is implemented.

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