Electromagnetic wave interference suppression method, circuit and equipment

Abstract

The invention provides an electromagnetic wave interference suppression method, circuit and equipment. The method comprises the following steps: acquiring an electromagnetic wave frequency between a signal transmitting end and a load receiving end in a superconducting quantum computing system; determining an electromagnetic wave interference suppression mode according to the electromagnetic wave frequency; the electromagnetic wave interference suppression method comprises the following steps: controlling an operational amplifier unit to compensate a first reference ground potential corresponding to a signal transmitting end and a second reference ground potential corresponding to a load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential, so that the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of the electromagnetic waves on the coaxial line shell is eliminated, the interference of the electromagnetic waves on the quantum calculation data transmission process is further inhibited, and the anti-interference capability on the electromagnetic waves is improved.

Description

Technical Field

[0001] This application relates to the field of quantum computing technology, and more specifically, to an electromagnetic interference suppression method, circuit, and device. Background Technology

[0002] Superconducting quantum computing requires extremely high precision in signal transmission, typically down to the μV level. Therefore, the stability of the reference ground line is crucial at both the data receiving and transmitting ends during signal transmission and processing. However, interference from spatial electromagnetic waves (such as those generated during the startup or operation of other equipment in the laboratory) often exists in the laboratory, leading to data distortion during transmission.

[0003] Currently, the solution to the impact of electromagnetic waves in space on signal transmission is usually to select better shielded cables to reduce the influence of high-frequency electromagnetic waves in space. However, there are also many mid- and low-frequency electromagnetic waves in the superconducting quantum computing environment, and these mid- and low-frequency electromagnetic waves are widely distributed. Using shielding materials cannot effectively reduce mid- and low-frequency electromagnetic waves, which leads to a high risk of data distortion during quantum computing data transmission. Summary of the Invention

[0004] The purpose of this application is to provide an electromagnetic interference suppression method, circuit, and device to solve the problem that current methods of using shielding materials to suppress spatial electromagnetic waves in quantum computing environments cannot effectively reduce low- and mid-frequency electromagnetic waves, resulting in a high risk of data distortion during quantum computing data transmission.

[0005] In a first aspect, this application provides an electromagnetic interference suppression method, which includes: acquiring the electromagnetic wave frequency between a signal transmitting end and a load receiving end in a superconducting quantum computing system; determining an electromagnetic interference suppression method based on the electromagnetic wave frequency; wherein the electromagnetic interference suppression method includes controlling an operational amplifier unit to compensate for a first reference ground potential corresponding to the signal transmitting end and a second reference ground potential corresponding to the load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential.

[0006] The electromagnetic interference suppression method provided in this solution compensates the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end through an operational amplifier unit, so that the compensated first reference ground potential and the second reference ground potential are equal, thereby eliminating the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of electromagnetic waves on the coaxial cable shell, and thus suppressing the interference of electromagnetic waves in the quantum computing data transmission process and improving the anti-interference capability of electromagnetic waves.

[0007] In an optional embodiment of the first aspect, determining the electromagnetic interference suppression method based on the electromagnetic wave frequency includes: determining whether the electromagnetic wave frequency is less than a first frequency threshold; if the electromagnetic wave frequency is less than the first frequency threshold, determining whether the electromagnetic wave frequency is less than a second frequency threshold; wherein the second frequency threshold is less than the first frequency threshold; if the electromagnetic wave frequency is not less than the second frequency threshold, controlling the operational amplifier unit to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential.

[0008] In an optional embodiment of the first aspect, the method further includes: if it is determined that the electromagnetic wave frequency is less than a second frequency threshold, then calculating the target shielding layer thickness based on the electromagnetic wave frequency; wherein the target shielding layer thickness represents the shielding layer thickness of the coaxial cable housing between the signal transmitting end and the load receiving end; increasing the shielding layer thickness of the coaxial cable housing between the signal transmitting end and the load receiving end to the target shielding layer thickness, and controlling the operational amplifier unit to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential.

[0009] In the above-described implementation, this solution can implement different electromagnetic interference suppression methods at different electromagnetic wave frequencies, thereby improving the accuracy of electromagnetic wave suppression. Specifically, when the electromagnetic wave frequency between the signal transmitter and the load receiver is in the low-frequency band, this solution not only uses operational amplifier compensation to eliminate the signal measurement error between the signal transmitter and the load receiver caused by the influence of electromagnetic waves on the coaxial cable housing, but also increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to improve the core's ability to resist interference from external low-frequency electromagnetic waves, thereby further improving the suppression effect of electromagnetic waves between the signal transmitter and the load receiver.

[0010] In an optional embodiment of the first aspect, determining the electromagnetic interference suppression method based on the electromagnetic wave frequency includes: determining whether the electromagnetic wave frequency is less than a first frequency threshold; if the electromagnetic wave frequency is less than the first frequency threshold, determining whether the electromagnetic wave frequency is less than a second frequency threshold, wherein the second frequency threshold is greater than the first frequency threshold; if the electromagnetic wave frequency is not less than the second frequency threshold, calculating the target shielding layer thickness based on the electromagnetic wave frequency; wherein the target shielding layer thickness represents the shielding layer thickness of the coaxial cable housing between the signal transmitting end and the load receiving end; increasing the shielding layer thickness of the coaxial cable housing between the signal transmitting end and the load receiving end to the target shielding layer thickness, and controlling the operational amplifier unit to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential.

[0011] In the above implementation method, this solution not only uses operational amplifier compensation to eliminate the signal measurement error between the signal transmitter and the load receiver caused by the influence of electromagnetic waves on the coaxial cable housing, but also increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to improve the core's ability to resist interference from external low-frequency electromagnetic waves, thereby further improving the suppression effect on electromagnetic waves between the signal transmitter and the load receiver.

[0012] Secondly, this application provides an electromagnetic interference suppression circuit, which includes an operational amplifier unit, which is electrically connected to the signal transmitting end and the load receiving end of the superconducting quantum computing system, respectively; the operational amplifier unit is used to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein the compensated first reference ground potential is equal to the second reference ground potential.

[0013] The electromagnetic interference suppression circuit designed above compensates for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end through the operational amplifier unit, so that the compensated first reference ground potential is equal to the second reference ground potential, thereby eliminating the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of electromagnetic waves on the coaxial cable shell, and thus suppressing the interference of electromagnetic waves in the quantum computing data transmission process and improving the anti-interference capability of electromagnetic waves.

[0014] In an optional embodiment of the second aspect, the non-inverting input terminal of the operational amplifier unit is electrically connected to the first reference ground corresponding to the signal transmitting terminal, the inverting input terminal of the operational amplifier unit is electrically connected to the second reference ground corresponding to the load receiving terminal, and the output terminal of the operational amplifier unit is electrically connected to the second reference ground corresponding to the load receiving terminal.

[0015] In an alternative embodiment of the second aspect, the circuit further includes a power supply unit, which includes a power supply and a first resistor. The output terminal of the power supply is electrically connected to the power supply terminal of the operational amplifier unit, and the ground terminal of the power supply is grounded through the first resistor.

[0016] In the above implementation, the grounding terminal of the power supply of the operational amplifier unit is grounded through a first resistor. By setting a first resistor with a large resistance value, the power supply of the operational amplifier unit can present a high resistance to ground, thereby avoiding the formation of an additional noise loop superimposed on the output terminal of the operational amplifier due to the connection of the operational amplifier unit, which would affect the compensation of the reference ground potential and thus improve the reliability of the operational amplifier compensation.

[0017] Thirdly, the present invention provides an electromagnetic interference suppression device, which includes a coaxial housing and an operational amplifier interference suppression module; wherein the operational amplifier interference suppression module includes an electromagnetic interference suppression circuit according to any one of the second aspects, for electrically connecting to a first reference ground corresponding to the target signal transmitting end and a second reference ground corresponding to the target load receiving end in the superconducting quantum computing system.

[0018] The electromagnetic interference suppression device designed above not only uses operational amplifier compensation to eliminate signal measurement errors between the signal transmitter and the load receiver caused by the influence of electromagnetic waves on the coaxial cable housing, but also increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to improve the core's ability to resist interference from external low-frequency electromagnetic waves, thereby further improving the suppression effect of electromagnetic waves between the signal transmitter and the load receiver.

[0019] In an optional embodiment of the fourth aspect, the coaxial housing includes a coaxial outer shell and a metal shielding shell, wherein the metal shielding shell is sleeved on the coaxial line between the target signal transmitter and the target load receiver, and the coaxial outer shell is sleeved on the metal shielding shell.

[0020] In the above-described implementation, this solution effectively increases the thickness of the coaxial cable shielding layer by combining the coaxial cable outer shell with a metal shielding shell, thereby improving the core's ability to resist interference from low-frequency electromagnetic waves from the outside world, and further enhancing the suppression effect on electromagnetic waves between the signal transmitting end and the load receiving end.

[0021] In an alternative embodiment of the fourth aspect, the shielding thickness of the coaxial cable housing is determined based on the electromagnetic wave frequency between the target signal transmitter and the target load receiver.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the electromagnetic interference suppression process provided in the embodiments of this application; Figure 2This is a first structural diagram of the electromagnetic interference suppression circuit provided in the embodiments of this application; Figure 3 This is a second structural diagram of the electromagnetic interference suppression circuit provided in the embodiments of this application; Figure 4 This is a first example diagram of an electromagnetic interference suppression circuit provided in an embodiment of this application; Figure 5 A simulation model diagram of the electromagnetic interference suppression circuit provided in the embodiments of this application; Figure 6 The simulation test results diagram provided for the embodiments of this application; Figure 7 Equivalent circuit diagram of coaxial cable with no impedance provided in the embodiments of this application; Figure 8 Equivalent circuit diagram of the coaxial cable with wire resistance provided in the embodiments of this application; Figure 9 The equivalent circuit diagram with operational amplifier and closed loop provided in the embodiments of this application; Figure 10 The test network circuit diagram provided in the embodiments of this application; Figure 11 The interference source at 150kHz provided in this application embodiment is shown in the RC open-circuit test result diagram. Figure 12 The interference source 150kHz provided in the embodiments of this application is shown in the RC short-circuit test result diagram; Figure 13 The diagram shows the test results of the operational amplifier operating under a 150kHz interference source, RC short circuit, and operational amplifier operation, as provided in the embodiments of this application. Figure 14 The interference source at 300kHz provided in this application embodiment is shown in the RC open-circuit test result diagram. Figure 15 The interference source 300kHz provided in the embodiments of this application is shown in the RC short-circuit test result diagram; Figure 16 The diagram shows the test results of the operational amplifier operating under the following conditions: interference source 300kHz, RC short circuit, and operational amplifier operation, as provided in the embodiments of this application. Figure 17 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0025] Icons: 10-Operational amplifier unit; 20-Power supply unit; 210-Power supply; 220-First resistor; A-Signal transmitter; B-Load receiver; 17-Electronic device; 1701-Processor; 1702-Memory; 1703-Communication bus. Detailed Implementation

[0026] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0029] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0032] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] Superconducting quantum computing requires extremely high precision in signal transmission, typically down to the μV level. Therefore, the stability of the reference ground line is crucial at both the data receiving and transmitting ends during signal transmission and processing. However, interference from spatial electromagnetic waves (such as those generated during the startup or operation of other equipment in the laboratory) often exists in the laboratory, leading to data distortion during transmission.

[0035] Currently, the solution to the impact of electromagnetic waves in space on signal transmission is usually to select better shielded cables to reduce the influence of high-frequency electromagnetic waves in space. However, there are also many mid- and low-frequency electromagnetic waves in the superconducting quantum computing environment, and these mid- and low-frequency electromagnetic waves are widely distributed. Using shielding materials cannot effectively reduce mid- and low-frequency electromagnetic waves, which leads to a high risk of data distortion during quantum computing data transmission.

[0036] To address the aforementioned issues, this application designs an electromagnetic interference suppression method, circuit, and device. By using an operational amplifier unit to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end, the compensationd first reference ground potential is made equal to the second reference ground potential. This eliminates the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of electromagnetic waves on the coaxial cable housing, thereby suppressing electromagnetic interference in quantum computing data transmission and improving the anti-interference capability against electromagnetic waves. Simultaneously, this solution reduces electromagnetic interference to the core of the coaxial cable transmitting quantum computing data by adding a coaxial cable housing, improving the anti-interference capability against electromagnetic waves in the signal transmission path. Finally, this solution ensures that the power supply of the operational amplifier unit presents high impedance to ground, preventing the formation of additional noise loops superimposed on the operational amplifier output due to operational amplifier connection, which could lead to compensation failure and improve the reliability of operational amplifier compensation.

[0037] Based on the above ideas, this application first provides an electromagnetic interference suppression method. This electromagnetic interference suppression method can be applied to computing devices, including but not limited to computers, servers, control chips, etc. Figure 1 As shown, this electromagnetic interference suppression method can be implemented in the following ways: Step S100: Collect the electromagnetic wave frequency between the signal transmitter and the load receiver in the superconducting quantum computing system.

[0038] Step S110: Determine the electromagnetic interference suppression method based on the electromagnetic wave frequency.

[0039] In the above embodiments, superconducting quantum computing is a technical approach to realize quantum computing based on superconducting qubits (superconducting quantum bits), which generally consists of a qubit chip, a cryogenic control system, and a microwave control system.

[0040] In a superconducting quantum computing system, the signal transmitter and load receiver can be the signal transmitter and load receiver of any target device in the superconducting quantum computing system. For example, it can be the signal transmitter and load receiver of the cryostat in the cryogenic control system of the superconducting quantum computing system, or the signal transmitter and load receiver of the cryogenic pulse cooler in the cryogenic control system of the superconducting quantum computing system, or the data acquisition and control system in the microwave control system, etc.

[0041] Space electromagnetic waves are electromagnetic field fluctuations propagating in space, formed by the mutual excitation and coupling of changing electric and magnetic fields. Because other operating devices (e.g., power supplies, electronic device oscillation circuits) exist in the superconducting quantum computing environment, space electromagnetic waves generated during the startup or operation of these devices exist between the signal transmitter and the load receiver in the superconducting quantum computing system. This scheme can collect and measure the space electromagnetic waves existing between the signal transmitter and the load receiver to obtain their electromagnetic wave frequency. Specifically, as a possible implementation, this scheme can use a spectrum analyzer to collect and measure the space electromagnetic waves existing between the signal transmitter and the load receiver.

[0042] In this scheme, after obtaining the electromagnetic wave frequency between the signal transmitter and the load receiver through the above method, the electromagnetic wave interference suppression method is determined based on the electromagnetic wave frequency. The electromagnetic wave interference suppression method includes controlling the operational amplifier unit to compensate the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver, so that the compensated first reference ground potential is equal to the second reference ground potential.

[0043] The electromagnetic interference suppression method designed above compensates the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end through the operational amplifier unit, so that the compensated first reference ground potential and the second reference ground potential are equal, thereby eliminating the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of electromagnetic waves on the coaxial cable shell, thereby suppressing the interference of electromagnetic waves on the quantum computing data transmission process and improving the anti-interference capability of electromagnetic waves.

[0044] In an optional implementation of this embodiment, as described above, this solution can determine the electromagnetic interference suppression method based on the electromagnetic wave frequency. That is, at different electromagnetic wave frequencies, this solution can implement different electromagnetic interference suppression methods. Specifically, as one possible implementation, this solution can determine whether the electromagnetic wave frequency is less than a first frequency threshold. If the electromagnetic wave frequency is less than the first frequency threshold, this solution can further determine whether the electromagnetic wave frequency is less than a second frequency threshold, wherein the second frequency threshold is less than the first frequency threshold.

[0045] When the electromagnetic wave frequency is not less than the second frequency threshold, this scheme assumes that the electromagnetic wave frequency between the signal transmitter and the load receiver is in the mid-frequency band. Therefore, this scheme can use operational amplifier compensation alone. That is, this scheme controls the operational amplifier unit to compensate the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver, so that the compensated first reference ground potential is equal to the second reference ground potential.

[0046] When the electromagnetic wave frequency is less than the second frequency threshold, this solution assumes that the electromagnetic wave frequency between the signal transmitter and the load receiver is in the low-frequency band. Therefore, this solution not only employs operational amplifier compensation but also increases the shielding thickness of the coaxial cable housing between the signal transmitter and the load receiver. Specifically, this solution calculates the target shielding thickness based on the electromagnetic wave frequency, then increases the shielding thickness of the coaxial cable housing between the signal transmitter and the load receiver to the target shielding thickness. The operational amplifier unit is then controlled to compensate for the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver, ensuring that the compensated first reference ground potential is equal to the second reference ground potential.

[0047] As another possible implementation, this solution can also be used when the electromagnetic wave frequency between the signal transmitter and the load receiver is in the mid-frequency band. This can be achieved by using operational amplifier compensation combined with increasing the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver. Specifically, when the electromagnetic wave frequency is less than a first frequency threshold and not less than a second frequency threshold, this solution calculates the target shielding layer thickness based on the electromagnetic wave frequency. Then, it increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to the target shielding layer thickness. The operational amplifier unit is then controlled to compensate for the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver, ensuring that the compensated first reference ground potential is equal to the second reference ground potential.

[0048] In the above-described implementation, when the electromagnetic wave frequency between the signal transmitter and the load receiver is in the low-frequency band, this solution not only uses operational amplifier compensation to eliminate the signal measurement error between the signal transmitter and the load receiver caused by the influence of electromagnetic waves on the coaxial cable housing, but also increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to improve the core's ability to resist interference from external low-frequency electromagnetic waves, thereby further improving the suppression effect on electromagnetic waves between the signal transmitter and the load receiver.

[0049] In an optional embodiment of this solution, the method for calculating the target shielding layer thickness based on the electromagnetic wave frequency can specifically employ a target shielding layer thickness calculation formula. The target shielding layer thickness calculation formula is as follows: ; in, The frequency of electromagnetic waves; The magnetic permeability of the shielding layer; The conductivity of the shielding layer, The target shielding layer thickness.

[0050] In the above implementation method, this solution calculates the target shielding layer thickness based on the electromagnetic wave frequency, thereby increasing the shielding layer thickness of the coaxial cable housing between the signal transmitting end and the load receiving end to improve the core's ability to resist interference from external low-frequency electromagnetic waves.

[0051] This application also provides an electromagnetic interference suppression circuit, which can realize the function described above of compensating the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end through an operational amplifier unit, so that the compensated first reference ground potential is equal to the second reference ground potential. Specifically, as Figure 2 As shown, the electromagnetic interference suppression circuit may include an operational amplifier unit 10. The operational amplifier unit 10 is electrically connected to the signal transmitting end A and the load receiving end B in the superconducting quantum computing system. Specifically, the non-inverting input terminal of the operational amplifier unit 10 is electrically connected to the first reference ground corresponding to the signal transmitting end A, the inverting input terminal of the operational amplifier unit 10 is electrically connected to the second reference ground corresponding to the load receiving end B, and the output terminal of the operational amplifier unit 10 is electrically connected to the second reference ground corresponding to the load receiving end B.

[0052] The operational amplifier unit 10 designed above can compensate for the first reference ground potential corresponding to the signal transmitting end A and the second reference ground potential corresponding to the load receiving end B, so that the compensated first reference ground potential is equal to the second reference ground potential. Specifically, the operational amplifier unit 10 feeds back part or all of the signal output to the load receiving end B to the inverting input end through a feedback loop, forming a closed-loop system, which forces the first reference ground potential corresponding to the signal transmitting end A connected to the non-inverting input end of the operational amplifier unit 10 to be equal to the second reference ground potential corresponding to the load receiving end B connected to the inverting input end.

[0053] The electromagnetic interference suppression circuit designed above compensates for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end through the operational amplifier unit, so that the compensated first reference ground potential is equal to the second reference ground potential, thereby eliminating the signal measurement error between the signal transmitting end and the load receiving end caused by the influence of electromagnetic waves on the coaxial cable shell, and thus suppressing the interference of electromagnetic waves in the quantum computing data transmission process and improving the anti-interference capability of electromagnetic waves.

[0054] In an optional implementation of this embodiment, such as Figure 3 As shown, the circuit designed in this scheme also includes a power supply unit 20, which includes a power supply 210 and a first resistor 220. The output terminal of the power supply 210 is electrically connected to the power supply terminal of the operational amplifier unit 10, and the ground terminal of the power supply 210 is grounded through the first resistor 220.

[0055] In the above implementation, the grounding terminal of the power supply 210 of the operational amplifier unit 10 is grounded through a first resistor 220. By setting a relatively large resistance value for the first resistor 220, the power supply 210 of the operational amplifier unit 10 can present a high resistance to ground, thereby avoiding the formation of an additional noise loop superimposed on the output terminal of the operational amplifier due to the connection of the operational amplifier unit 10, which would affect the compensation of the reference ground potential and thus improve the reliability of the operational amplifier compensation. Specifically, the resistance value of the first resistor 220 designed in this solution can be 100 ohms, 200 ohms, etc., and the specific value can be adaptively adjusted according to the actual application scenario.

[0056] In implementing the compensation scheme for operational amplifier unit 10, this solution needs to consider the operational amplifier's own tracking effect on the input signal, its suppression effect on power supply noise, the operational amplifier's tendency to self-oscillate during operation (insufficient driving capability, positive feedback), and the form of electromagnetic wave radiation in order to fully solve the interference problem caused by spatial electromagnetic waves. To this end, this solution implements the following simulation model construction for simulation and tests the simulation results to verify that the above scheme can achieve a good electromagnetic wave suppression effect, as detailed below: Specifically, such as Figure 4 As shown, taking the refrigerator of the superconducting computing system as an example, the radio frequency port A of the refrigerator is connected to instrument A, and the radio frequency port B of the refrigerator is connected to instrument B. The non-inverting input terminal of the operational amplifier unit 10 designed in this scheme can be connected to the first reference ground of instrument A, and the inverting input terminal and the output terminal of the operational amplifier unit 10 are connected to the second reference ground of instrument B.

[0057] Since coaxial cables generally offer good shielding against external electromagnetic interference, we will first consider the simulation model where electromagnetic waves only affect the coaxial cable housing. For example... Figure 5 As shown, due to multiple electromagnetic interferences in space, the frequency and amplitude of electromagnetic interference experienced by the reference GND of instruments A and B may differ. Therefore, a voltage signal with a frequency of 5KHz and an amplitude of 3mV is used to simulate the electromagnetic interference signal at point A, and an AC voltage signal with a frequency of 10KHz and an amplitude of 20mV is used to simulate the noise at point B at the reference point of instrument B. Since instruments will be connected to detect the noise level during the actual measurement process, a 1M ohm and 50nF capacitor to ground is used to simulate the influence of the measurement instrument on the loop impedance and capacitive load during the connection process.

[0058] A 3mV interference signal is applied to the IN+ terminal of the operational amplifier to simulate noise at the GNDA terminal. Using the GNDA as a reference, the GNDB voltage is regulated. In actual testing, there is a very small resistance between the GNDA and GNDB. The resistance is set to 0.3 ohms, and the resistance of the interference source to ground at the IN+ terminal is 0.5 ohms. This simulation parameter configuration involves the derivation of the following formulas:

[0059] Based on the above formula, it can be seen that in order to prevent the op-amp from forming positive feedback, it is necessary to ensure that This means maximizing the value of resistor R171, which increases the impedance between GNDA and GNDB, and decreasing the value of feedback loop resistor R166. The smaller the value of R166, the more consistent the voltage at the out output terminal is with the reference voltage at IN+, resulting in better compensation for loop interference signals.

[0060] Simulation test results are as follows Figure 6 As shown, the light-colored arc represents the noise signal at point A, and the dark-colored arc represents the noise signal at point B. Figure 6 It can be seen that when an operational amplifier is used for compensation, the amplitude, frequency, and phase at point B are basically the same as those at point A.

[0061] pass Figure 6 After simulation data, the reference potentials at points B and A were basically the same during the actual test, that is, the noise amplitude, phase and frequency were basically the same. However, the spatial electromagnetic wave interference was still not well resolved. Therefore, we conducted an in-depth analysis of the noise-affected points and considered the situation where the coaxial cable shell failed to completely shield the spatial electromagnetic waves, resulting in interference to the wire core.

[0062] Without considering the coaxial line resistance or adding operational amplifiers, the equivalent circuit diagram between instrument A and instrument B can be shown as follows: Figure 7 As shown, where It is an equivalent ideal voltage source for core coupling. This is an equivalent ideal voltage source coupled to the shielding layer. It approximately satisfies... . This refers to the internal resistance of the measuring terminal (oscilloscope). This is the load resistance. Let the resistance at the connection point be defined. Define the measurement signal. for Using the principle of linear superposition, the voltages at both ends can be obtained as follows: ; It is evident that when the coaxial cable has no impedance (i.e., the coaxial cable is extremely short), there is no crosstalk in the measurement signal, but this condition is usually not met.

[0063] Considering the resistance of the coaxial line, the equivalent circuit diagram between instrument A and instrument B can be shown as follows: Figure 8 As shown, where and These are the resistances of the wire core and the shielding layer, respectively. At this point: ; It can be seen that crosstalk in voltage measurement is related to the resistance at the connection point. With shielding layer resistance It is related to the ratio. when When directly connected, the crosstalk amplitude is at its maximum. .

[0064] when Time (e.g.) (Series resistor), crosstalk amplitude is extremely small. .

[0065] when and When comparable, the result lies somewhere in between.

[0066] Consider the equivalent circuit of the op-amp closed loop, such as Figure 9 As shown, (assuming the op-amp is working normally, since the op-amp has a very large open-loop gain, its equivalent output impedance is extremely small, and the whole is equivalent to ground).

[0067] at this time: ; As can be seen, after operational amplifier compensation, the crosstalk amplitude in the measured signal remains at its maximum value, i.e. Larger compensations can worsen crosstalk. At that time, compensation had no effect.

[0068] Therefore, when considering shielding low-frequency electromagnetic waves, it is necessary to use a coaxial cable housing with a thicker shielding layer to prevent the wire core from being interfered with by external electromagnetic waves. After ensuring that the wire core is not interfered with, the two ends of the reference ground are compensated for equipotentially through an operational amplifier so that the U0 voltage does not exist. This will provide a better shielding effect against external electromagnetic interference.

[0069] Solution verification: The test network is as follows Figure 10 As shown, an electromagnetic radiation source is simulated by connecting a signal source to an antenna to radiate the coaxial cable. Instrument B (oscilloscope) is used to detect the interference signal on the cable. The configuration parameters of the operational amplifier peripheral circuit are consistent with the configuration parameters of the simulation model. When verifying the housing loop resistor RC, the noise value and compensation effect are verified under both short-circuit and open-circuit conditions, proving the sufficiency of the theoretical analysis. The actual test results are basically consistent with the theoretical analysis.

[0070] The selected cable is a Rosenberger cable with a shielding thickness of approximately 0.2mm. According to the skin depth formula mentioned earlier, a shielding thickness of 0.2mm can provide good shielding for kHz frequencies and has a good shielding effect for electromagnetic wave frequencies above 109.293kHz.

[0071] Specifically: when the frequency of the electromagnetic interference signal is 150kHz, R C The following phenomena were observed during oscilloscope testing under open-circuit conditions. Figure 11As shown, the noise amplitude is -68.38dB @150kHz and -83.67dB @450kHz.

[0072] When the electromagnetic interference signal frequency is 150kHz, the oscilloscope test results under RC short-circuit conditions are as follows. Figure 12 As shown, the noise amplitude is -87.1dB @150kHz and -100.3dB @450kHz.

[0073] When the electromagnetic interference signal frequency is 150kHz, under RC short-circuit conditions, the op-amp operates, and the oscilloscope test results are as follows: Figure 13 As shown, the noise amplitude is -92.35dB @150kHz and -116.8dB @450kHz.

[0074] The above experimental results prove the correctness of considering the equivalent circuit of the coaxial line resistance and the equivalent circuit with operational amplifier and closed loop. With a certain thickness of shielding layer, the core can be prevented from being interfered with by external electromagnetic waves. At this time, only the voltage Uo exists. When R... C When R is large, the measured amplitude of the interference signal is large. C When the short circuit approaches zero, the measured interference signal amplitude is smaller, and the operational amplifier circuit noise is lower, which has a certain suppression effect on external electromagnetic interference.

[0075] For example, when the frequency of the electromagnetic interference signal is 330Hz, R C The following phenomena were observed during oscilloscope testing under open-circuit conditions. Figure 14 As shown, the noise amplitude is -103.9dB @300Hz.

[0076] When the frequency of the electromagnetic interference signal is 330Hz, R C Under short-circuit conditions, the op-amp does not work, and the oscilloscope test results are as follows: Figure 15 As shown, the noise amplitude is -95.44dB @300Hz, at which point the measured noise amplitude is significantly larger.

[0077] When the frequency of the electromagnetic interference signal is 330Hz, R C Under short-circuit conditions, the op-amp operates, and the oscilloscope test results are as follows: Figure 16 As shown, the noise amplitude is -95.62dB @300Hz, and the measured noise amplitude does not change at this time.

[0078] The above measured phenomena demonstrate that, when faced with low-frequency electromagnetic wave interference, due to the influence of skin depth, the wire core is affected by external low-frequency electromagnetic wave interference, U I with U O Voltages exist simultaneously and in the same direction; when R C When R is large, the noise amplitude of the test is small. CWhen the short circuit approaches zero, the measured amplitude of the interference signal increases (at this point, the noise is U). I When the op-amp is working (at this time U O Similarly, it approaches 0, and the noise is U. I Therefore, at low frequencies, if the cable shielding layer is not thick enough, the operational amplifier will have virtually no effect. Thus, by increasing the thickness of the coaxial cable shielding layer, the operational amplifier can effectively suppress low-frequency electromagnetic interference.

[0079] This application also provides an electromagnetic interference suppression device, which includes a coaxial housing and an operational amplifier interference suppression module; wherein, the operational amplifier interference suppression module includes the electromagnetic interference suppression circuit described above, and the operational amplifier unit of the electromagnetic interference suppression circuit is used to electrically connect to a first reference ground corresponding to the target signal transmitting end and a second reference ground corresponding to the target load receiving end in the superconducting quantum computing system.

[0080] The electromagnetic interference suppression device designed above not only uses operational amplifier compensation to eliminate signal measurement errors between the signal transmitter and the load receiver caused by the influence of electromagnetic waves on the coaxial cable housing, but also increases the shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver to improve the core's ability to resist interference from external low-frequency electromagnetic waves, thereby further improving the suppression effect of electromagnetic waves between the signal transmitter and the load receiver.

[0081] In an optional embodiment of this invention, the coaxial cable housing includes a coaxial cable outer shell and a metal shielding shell. The metal shielding shell is fitted onto the coaxial cable between the target signal transmitter and the target load receiver, and the coaxial cable outer shell is fitted onto the metal shielding shell. Specifically, the metal shielding shell can be made of materials with high conductivity, such as silver, copper, aluminum, or iron; the coaxial cable outer shell can be made of materials such as silver-plated copper or bare copper.

[0082] In the above-described implementation, this solution effectively increases the thickness of the coaxial cable shielding layer by combining the coaxial cable outer shell with a metal shielding shell, thereby improving the core's ability to resist interference from low-frequency electromagnetic waves from the outside world, and further enhancing the suppression effect on electromagnetic waves between the signal transmitting end and the load receiving end.

[0083] In an optional embodiment of this example, the thickness of the coaxial cable housing is determined based on the electromagnetic wave frequency between the target signal transmitter and the target load receiver. The specific determination method has been described above and will not be repeated here.

[0084] According to some embodiments of this application, such as Figure 17As shown, this application provides an electronic device 17, including: a processor 1701 and a memory 1702. The processor 1701 and the memory 1702 are interconnected and communicate with each other through a communication bus 1703 and / or other forms of connection mechanism (not shown). The memory 1702 stores a computer program executable by the processor 1701. When the computing device is running, the processor 1701 executes the computer program to perform any optional implementation method, such as steps S100 to S110: acquiring the electromagnetic wave frequency between the signal transmitting end and the load receiving end in the superconducting quantum computing system; and determining the electromagnetic wave interference suppression method based on the electromagnetic wave frequency.

[0085] This application provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the method in any of the aforementioned optional implementations.

[0086] The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0087] This application provides a computer program product that, when run on a computer, causes the computer to perform a method in any of the optional implementations.

[0088] In summary, this scheme compensates for the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver using an operational amplifier unit. This ensures that the compensated first and second reference ground potentials are equal, thereby eliminating signal measurement errors between the signal transmitter and load receiver caused by the influence of electromagnetic waves on the coaxial cable housing. This, in turn, suppresses electromagnetic interference in quantum computing data transmission and improves the anti-interference capability against electromagnetic waves. Simultaneously, this scheme reduces electromagnetic interference to the core of the coaxial cable transmitting quantum computing data by adding a coaxial cable housing, further improving the anti-interference capability against electromagnetic waves in the signal transmission path. Furthermore, this scheme ensures that the power supply of the operational amplifier unit presents high impedance to ground, preventing the formation of additional noise loops at the operational amplifier output due to operational amplifier connection, which could lead to compensation failure and improve the reliability of operational amplifier compensation. Finally, this scheme is verified through simulation analysis and network testing to ensure its feasibility and effectiveness.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for suppressing electromagnetic interference, characterized in that, The method includes: Collect the electromagnetic wave frequency between the signal transmitter and the load receiver in a superconducting quantum computing system; Based on the electromagnetic wave frequency, an electromagnetic interference suppression method is determined; wherein, the electromagnetic interference suppression method includes controlling the operational amplifier unit to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein, the compensated first reference ground potential is equal to the second reference ground potential.

2. The method according to claim 1, characterized in that, The step of determining the electromagnetic interference suppression method based on the electromagnetic wave frequency includes: Determine whether the frequency of the electromagnetic wave is less than a first frequency threshold; If the frequency of the electromagnetic wave is less than a first frequency threshold, then it is determined whether the frequency of the electromagnetic wave is less than a second frequency threshold; wherein the second frequency threshold is greater than the first frequency threshold. If the electromagnetic wave frequency is not less than the second frequency threshold, the control operational amplifier unit compensates for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein, the compensated first reference ground potential is equal to the second reference ground potential.

3. The method according to claim 2, characterized in that, The method further includes: If the electromagnetic wave frequency is determined to be less than the second frequency threshold, the target shielding layer thickness is calculated based on the electromagnetic wave frequency; wherein, the target shielding layer thickness represents the shielding layer thickness of the coaxial housing between the signal transmitting end and the load receiving end; The shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver is increased to the target shielding layer thickness, and the operational amplifier unit is controlled to compensate for the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver; wherein the compensated first reference ground potential is equal to the second reference ground potential.

4. The method according to claim 1, characterized in that, The step of determining the electromagnetic interference suppression method based on the electromagnetic wave frequency includes: Determine whether the frequency of the electromagnetic wave is less than a first frequency threshold; If the frequency of the electromagnetic wave is less than a first frequency threshold, then it is determined whether the frequency of the electromagnetic wave is less than a second frequency threshold; wherein the second frequency threshold is greater than the first frequency threshold. If the electromagnetic wave frequency is not less than the second frequency threshold, the target shielding layer thickness is calculated based on the electromagnetic wave frequency; wherein, the target shielding layer thickness represents the shielding layer thickness of the coaxial housing between the signal transmitting end and the load receiving end; The shielding layer thickness of the coaxial cable housing between the signal transmitter and the load receiver is increased to the target shielding layer thickness, and the operational amplifier unit is controlled to compensate for the first reference ground potential corresponding to the signal transmitter and the second reference ground potential corresponding to the load receiver; wherein the compensated first reference ground potential is equal to the second reference ground potential.

5. An electromagnetic interference suppression circuit, characterized in that, The circuit includes an operational amplifier unit, which is electrically connected to the signal transmitter and the load receiver in the superconducting quantum computing system, respectively. The operational amplifier unit is used to compensate for the first reference ground potential corresponding to the signal transmitting end and the second reference ground potential corresponding to the load receiving end; wherein, the compensated first reference ground potential is equal to the second reference ground potential.

6. The circuit according to claim 5, characterized in that, The non-inverting input terminal of the operational amplifier unit is electrically connected to the first reference ground corresponding to the signal transmitting terminal, the inverting input terminal of the operational amplifier unit is electrically connected to the second reference ground corresponding to the load receiving terminal, and the output terminal of the operational amplifier unit is electrically connected to the second reference ground corresponding to the load receiving terminal.

7. The circuit according to claim 6, characterized in that, The circuit also includes a power supply unit, which includes a power supply and a first resistor. The output terminal of the power supply is electrically connected to the power supply terminal of the operational amplifier unit, and the ground terminal of the power supply is grounded through the first resistor.

8. An electromagnetic interference suppression device, characterized in that, The electromagnetic interference suppression device includes a coaxial cable housing and an operational amplifier interference suppression module. The operational amplifier interference suppression module includes an electromagnetic interference suppression circuit as described in any one of claims 5-7, which is used to electrically connect to the first reference ground corresponding to the target signal transmitting end and the second reference ground corresponding to the target load receiving end in the superconducting quantum computing system. The coaxial cable housing is fitted onto the coaxial cable between the target signal transmitter and the target load receiver.

9. The electromagnetic interference suppression device according to claim 8, characterized in that, The coaxial cable housing includes a coaxial cable outer shell and a metal shielding shell, wherein the metal shielding shell is sleeved on the coaxial cable between the target signal transmitting end and the target load receiving end, and the coaxial cable outer shell is sleeved on the metal shielding shell.

10. The electromagnetic interference suppression device according to claim 9, characterized in that, The thickness of the coaxial cable housing is determined based on the electromagnetic wave frequency between the target signal transmitter and the target load receiver.

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