A quantum manipulation feedback system and method

Abstract

The embodiment of the present invention discloses a quantum manipulation feedback system and method, which reads a microwave signal for characterizing a quantum bit state generated by a superconducting quantum chip through a signal analysis module, analyzes the quantum bit value of each frequency point contained in the microwave signal, and sends each quantum bit value to a state processing module; determines the interference signal corresponding to each frequency point of the microwave signal through the state processing module, performs interference removal processing on each quantum bit value based on each interference signal, determines the quantum bit state of each frequency point based on the quantum bit value obtained after the interference removal processing, and sends the quantum bit state of each frequency point to a waveform generation module; and the waveform generation module outputs a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip, thereby solving the crosstalk between the quantum bits in the microwave signal and improving the accuracy and effectiveness of the quantum bit control process.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of quantum computing technology, and in particular, to a quantum manipulation feedback system and method. Background Art

[0002] Superconducting quantum computing requires a measurement and control system to manipulate quantum bits. The quantum manipulation feedback system is a crucial component of the superconducting quantum computing measurement and control system, which enables the reading of quantum states and the manipulation and feedback of quantum chips based on the reading results.

[0003] At present, in the prior art, a measurement and control network composed of multiple measurement and control subgroups is used to measure physical quantum bits, obtain the quantum state corresponding to the physical quantum bits, and send control instructions based on the quantum state to control the physical quantum bits. However, the control process in the prior art does not take into account the crosstalk between the read signals of each physical quantum bit, resulting in errors in the quantum state determination results, reducing the accuracy and effectiveness of controlling the quantum bits. Summary of the invention

[0004] The embodiments of the present invention provide a quantum manipulation feedback system and method to solve the crosstalk between quantum bits in microwave signals and improve the accuracy and effectiveness of the quantum bit control process.

[0005] In a first aspect, an embodiment of the present invention provides a quantum manipulation feedback system, comprising: a signal analysis module, a state processing module and a waveform generation module; wherein:

[0006] A signal analysis module, used to read the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit, analyze the quantum bit value of each frequency point contained in the microwave signal, and send each of the quantum bit values ​​to the state processing module;

[0007] a state processing module, configured to receive each of the qubit values, determine the interference signal corresponding to each of the frequency points of the microwave signal, perform interference removal processing on each of the qubit values ​​based on each of the interference signals, determine the qubit state of each of the frequency points based on the qubit value obtained after the interference removal processing, and send the qubit state of each of the frequency points to the waveform generation module;

[0008] A waveform generation module is used to receive the quantum bit state at each frequency point and output a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip.

[0009] In a second aspect, an embodiment of the present invention further provides a quantum manipulation feedback method, which is applied to a quantum manipulation feedback system composed of a signal analysis module, a state processing module and a waveform generation module, and the method includes:

[0010] The signal analysis module reads the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit, analyzes the quantum bit value of each frequency point contained in the microwave signal, and sends each of the quantum bit values ​​to the state processing module;

[0011] Receive each of the qubit values ​​through a state processing module, determine the interference signal corresponding to each of the frequency points of the microwave signal, perform interference removal processing on each of the qubit values ​​based on each of the interference signals, determine the qubit state of each of the frequency points based on the qubit value obtained after the interference removal processing, and send the qubit state of each of the frequency points to the waveform generation module;

[0012] The quantum bit state at each frequency point is received through a waveform generation module, and a digital waveform corresponding to the quantum bit state is output to perform feedback control on the quantum chip.

[0013] The quantum manipulation feedback system provided by the embodiment of the present invention includes a signal analysis module, a state processing module and a waveform generation module. The microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit is read through the signal analysis module, and the quantum bit value of each frequency point contained in the microwave signal is analyzed, and each quantum bit value is sent to the state processing module; the interference signal corresponding to each frequency point of the microwave signal is determined through the state processing module, and each quantum bit value is de-interfered based on each interference signal, and the quantum bit state of each frequency point is determined based on the quantum bit value obtained after the de-interference processing, and the quantum bit state of each frequency point is sent to the waveform generation module; and the waveform generation module outputs a digital waveform corresponding to the quantum bit state to feedback control the quantum chip. The crosstalk between the quantum bits in the microwave signal is solved, and the accuracy and effectiveness of the quantum bit control process are improved.

[0014] In addition, a quantum manipulation feedback method provided by the present invention corresponds to the above-mentioned system and has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A structural diagram of a quantum manipulation feedback system provided by an embodiment of the present invention;

[0017] Figure 2 A structural diagram of a signal analysis module provided in an embodiment of the present invention;

[0018] Figure 3 A structural diagram of a state processing module provided in an embodiment of the present invention;

[0019] Figure 4 A structural diagram of a quantum manipulation feedback control system provided by an embodiment of the present invention;

[0020] Figure 5 A flowchart of a quantum manipulation feedback method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] It should also be noted that, for ease of description, only the part relevant to the present invention but not all content is shown in the accompanying drawings. It should be mentioned before discussing exemplary embodiments in more detail that some exemplary embodiments are described as processing or methods depicted as flow charts. Although the flow chart describes each operation (or step) as sequential processing, many operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. When its operation is completed, the processing can be terminated, but it can also have additional steps not included in the accompanying drawings. The processing can correspond to methods, functions, procedures, subroutines, subprograms, etc.

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Embodiment 1

[0025] Figure 1 This is a structural diagram of a quantum manipulation feedback system provided by an embodiment of the present invention. Figure 1 As shown, the system of this embodiment may specifically include: a signal analysis module 10, a state processing module 11 and a waveform generation module 12; wherein,

[0026] The signal analysis module 10 is used to read the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit, analyze the quantum bit value of each frequency point contained in the microwave signal, and send each quantum bit value to the state processing module.

[0027] Specifically, the signal analysis module 10 can be connected to the superconducting quantum chip through an analog-to-digital converter. After the superconducting quantum chip emits a microwave signal, the microwave signal enters the room temperature environment after being amplified by components, and is converted into an intermediate frequency signal through orthogonal demodulation and then collected by the analog-to-digital converter. The analog-to-digital converter converts the collected intermediate frequency signal into a digital signal and sends the digital signal to the signal analysis module 10. It should be noted that for the microwave signal emitted from the superconducting quantum chip, each frequency point can be demodulated to obtain the quantum bits corresponding to the different frequency points contained in the microwave signal, and the time domain information of the frequency points corresponding to each quantum bit can be determined, including the frequency, amplitude and phase of the signal.

[0028] The state processing module 11 is used to receive each quantum bit value, determine the interference signal corresponding to each frequency point of the microwave signal, perform interference removal processing on each quantum bit value based on each interference signal, determine the quantum bit state of each frequency point based on the quantum bit value obtained after the interference removal processing, and send the quantum bit state of each frequency point to the waveform generation module.

[0029] Specifically, the quantum bits corresponding to each frequency point are coupled on the same reading line, so crosstalk will be formed between them. In order to obtain accurate and effective quantum bit values, the interference signals between the quantum bits of each frequency point can be removed by the state processing module 11.

[0030] The waveform generation module 12 is used to receive the quantum bit state at each frequency point and output a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip.

[0031] Optionally, the waveform generation module includes: a waveform parameter acquisition unit, which is used to determine the pre-set waveform parameters corresponding to each quantum bit state based on the received quantum bit state at each frequency point, and output a digital waveform according to each waveform parameter to feedback control the quantum chip.

[0032] Specifically, the waveform parameters corresponding to the quantum bit state at each frequency point can be pre-set. Based on the obtained quantum bit state at each frequency point, the corresponding waveform parameters are determined accordingly. Optionally, the waveform parameters include the frequency, phase and amplitude of the digital waveform. The digital waveform is output to the quantum chip according to the waveform parameters.

[0033] The quantum manipulation feedback system provided by the embodiment of the present invention includes a signal analysis module, a state processing module and a waveform generation module. The microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit is read through the signal analysis module, and the quantum bit value of each frequency point contained in the microwave signal is analyzed, and each quantum bit value is sent to the state processing module; the interference signal corresponding to each frequency point of the microwave signal is determined through the state processing module, and each quantum bit value is de-interfered based on each interference signal, and the quantum bit state of each frequency point is determined based on the quantum bit value obtained after the de-interference processing, and the quantum bit state of each frequency point is sent to the waveform generation module; and the waveform generation module outputs a digital waveform corresponding to the quantum bit state to feedback control the quantum chip. The crosstalk between the quantum bits in the microwave signal is solved, and the accuracy and effectiveness of the quantum bit control process are improved.

[0034] Embodiment 2

[0035] Figure 2 The structure diagram of the signal analysis module provided by the embodiment of the present invention is as follows: Figure 2 As shown, optionally, the signal analysis module provided by the embodiment of the present invention includes:

[0036] The digital filtering unit is used to perform low-pass filtering on the microwave signal according to a preset filtering bandwidth and update the microwave signal. Those skilled in the art can determine the specific value of the filtering bandwidth according to the actual application. The digital filtering unit provided in the embodiment of the present invention filters out the harmonic signal and the stray signal superimposed on the microwave signal.

[0037] Exemplarily, the digital filtering unit includes a real filtering unit and an imaginary filtering unit; the real filtering unit is used to perform low-pass filtering on the real signal, and the imaginary filtering unit is used to perform low-pass filtering on the imaginary signal. It should be noted that the real signal is specifically the real signal of the intermediate frequency signal generated after the microwave signal is orthogonally demodulated; the imaginary signal is specifically the imaginary signal of the intermediate frequency signal generated after the microwave signal is orthogonally demodulated.

[0038] Optional, signal analysis module, including:

[0039] The digital demodulation unit is used to demodulate the real signal and the imaginary signal corresponding to the microwave signal respectively, and generate the real frequency signal and the imaginary frequency signal corresponding to each frequency point; the integration unit is used to obtain the real frequency signal and the imaginary frequency signal corresponding to each frequency point, and perform time domain integration calculation on the real frequency signal and the imaginary frequency signal to obtain the real part integration result and the imaginary part integration result corresponding to each frequency point; wherein the quantum bit value is composed of the real part integration result and the imaginary part integration result, and the time domain integration time length is the acquisition time length of the microwave signal.

[0040] Specifically, the quantum bit value corresponding to each frequency point can be determined by determining the information corresponding to the real signal and the imaginary signal of the microwave signal. The quantum bit value can be understood as the amplitude of the quantum bit.

[0041] Furthermore, before the signal analysis module reads the microwave signal, the microwave signal can be orthogonally demodulated into a real signal and an imaginary signal by an orthogonal modulator. The real signal and the imaginary signal are intermediate frequency signals. The digital demodulation unit can read the real signal and the imaginary signal of the intermediate frequency signal, and demodulate the real signal and the imaginary signal respectively to obtain the real frequency signal and the imaginary frequency signal corresponding to each frequency point. The quantum bit value is determined based on the real frequency signal and the imaginary frequency signal.

[0042] For example, the microwave signal contains information of quantum bits at 10 frequency points. The digital demodulation unit in the signal analysis module reads the real signal V1(t) and the imaginary signal V2(t) of the microwave signal, and can determine the time domain information of the corresponding frequency points of each quantum bit in the microwave signal, including amplitude and phase, through the principle of discrete Fourier transform.

[0043] Specifically, the sine and cosine signals can be used to digitally demodulate the signals of different frequency points corresponding to the quantum bits to obtain the real frequency signal and the imaginary frequency signal. It should be noted that the imaginary frequency signal and the real frequency signal are both DC signals. The calculation formula is as follows:

[0044] A Re (t)=V1(t)cos(ωt)-V2(t)sin(ωt)

[0045] A Im (t)=V1(t)sin(ωt)-V2(t)cos(ωt)

[0046] Among them, A Re (t) is the real frequency signal obtained by demodulation when the frequency point is ω; A Im (t) is the demodulated frequency imaginary signal when the frequency point is ω, and t is the acquisition time.

[0047] Further, the real frequency signal and the imaginary frequency signal corresponding to each frequency point are integrated in the time domain by the integration unit to obtain the real integral result and the imaginary integral result corresponding to each frequency point, and the time domain integration duration is the acquisition duration of the microwave signal. Based on the real integral result and the imaginary integral result, the quantum bit value corresponding to each frequency point is determined. Exemplarily, the square sum of the real integral result and the imaginary integral result is calculated, and the value obtained after taking the square root of the square sum can be determined as the quantum bit value.

[0048] Exemplarily, the integration unit performs time domain integration operations on the real frequency signal and the imaginary frequency signal. The time length of the integration is determined by the acquisition time length of the microwave signal. The integration process is as follows:

[0049] Re(A)=∫[A Re (t)]dt

[0050] Im(A)=∫[A Im (t)]dt

[0051] Wherein, Re(A) is the real part integral result obtained by integrating the real part of the frequency signal, and Im(A) is the imaginary part integral result obtained by integrating the imaginary part of the frequency signal.

[0052] The embodiment of the present invention performs low-pass filtering on the microwave signal according to a preset filtering bandwidth through a digital filtering unit, filters out harmonic signals and stray signals superimposed on the microwave signal, and improves the accuracy of the microwave signal; demodulates the real signal and the imaginary signal corresponding to the microwave signal through a digital demodulation unit, respectively, to generate a real frequency signal and an imaginary frequency signal corresponding to each frequency point; obtains the real frequency signal and the imaginary frequency signal corresponding to each frequency point through an integration unit, performs time domain integration calculation on the real frequency signal and the imaginary frequency signal, and obtains the real part integration result and the imaginary part integration result corresponding to each frequency point; and improves the convenience of the calculation process.

[0053] Embodiment 3

[0054] Figure 3 The structural diagram of the state processing module provided in the embodiment of the present invention is as follows: Figure 3 As shown, the optional state processing module includes:

[0055] The rotation unit is used to perform coordinate system conversion on the quantum bit composed of the real part integral result and the imaginary part integral result according to a preset angle so that the imaginary part integral result is 0. Specifically, in the coordinate system, the quantum bit can use the real part integral result as the real axis data of the coordinate system, and the imaginary part integral result as the imaginary axis data. By converting the coordinate system, the imaginary part integral result can be converted to 0, and the real part integral result can be directly determined as the quantum bit value. At this time, the real part integral result can represent the size of the modulus value of the frequency point signal corresponding to the quantum bit, thereby avoiding the determination of the quantum bit value by complex calculation methods such as square root and square root, simplifying the calculation steps, and being able to quickly and accurately calculate the quantum bit value.

[0056] For example, the preset angle is set to Z, which can be expressed by the following formula:

[0057] Z=X+iY

[0058] Wherein, X is the horizontal coordinate value of the preset angle in the complex plane coordinate system, Y is the vertical coordinate value of the preset angle in the complex plane coordinate system, and i is an imaginary unit.

[0059] The conversion formula for converting the coordinate system of the quantum bit according to the preset angle is as follows:

[0060] V i,r +iV q,r =[Re(A)+iIm(A)]×Z

[0061] Among them, V i,r is the real part integral result after coordinate system transformation, V q,r is the imaginary integral result obtained after the coordinate system is converted. After the coordinate system is converted at a preset angle, V q,r is 0.

[0062] Optionally, the state processing module also includes:

[0063] The crosstalk elimination unit is used to calculate the total interference value of each frequency point based on each interference signal at each frequency point, determine the compensation matrix corresponding to each frequency point based on the total interference value, and multiply the compensation matrix with the real integral result of each frequency point obtained after the coordinate system is converted to obtain the quantum bit value after the interference removal processing. It should be noted that the quantum bit value here represents a value representing the signal size obtained after the aforementioned data processing of the signal corresponding to the frequency of a specific quantum bit. The value itself does not have a specific physical meaning, but is a value generated under the current data processing flow that can be used to distinguish the quantum bit state.

[0064] Specifically, the interference signal generated by the quantum bit corresponding to each frequency point to the quantum bit of the current frequency point can be determined, and the total interference value of each frequency point to the current frequency point can be calculated based on each interference signal. Further, the total interference value corresponding to each frequency point can be calculated respectively. And the supplementary matrix is ​​calculated based on the total interference value to eliminate the crosstalk between each quantum bit. It should be noted that when the microwave signal only includes quantum bits of a unique frequency point, there is no need to perform a crosstalk elimination operation.

[0065] For example, the signal strength value of the interference signal can be expressed as σ m,n , represents the signal strength value of the interference signal generated by the qubit at the mth frequency point to the qubit at the nth frequency point, and m and n are both positive integers. For example, when qubits at k frequency points are simultaneously input into the microwave signal, the total interference value of the interference signal formed by the k qubits on the first qubit is:

[0066] σ1=σ 2，1 +…+σ k，1

[0067] Among them, σ1 represents the total interference value of the interference signal formed on the first quantum bit by the other k-1 quantum bits except the first quantum bit.

[0068] In order to eliminate the interference to the quantum bits, the compensation matrix C can be determined based on the total interference value of the quantum bits at each frequency point, and the matrix composed of the quantum bit values ​​at each frequency point is multiplied to eliminate the interference of the quantum bits at each frequency point. For example, the number of frequency points is 10, and the compensation matrix can eliminate the interference of the quantum bits at 10 frequency points at the same time. Its operation expression is as follows:

[0069] (V1',V2',…V9',V1'0)=C×(V1,V2,…V9,V 10 )

[0070] Among them, V1', V2', ... V9', V 10 ' are the quantum bit values ​​of the quantum features of 10 frequency points after removing interference, V1, V2, ... V9, V 10 These are the quantum bit values ​​of the quantum features at 10 frequency points before interference is removed.

[0071] Optionally, the state processing module also includes:

[0072] The quantum state judgment module is used to obtain the judgment threshold corresponding to each frequency point, determine whether the quantum bit value corresponding to each frequency point is greater than the corresponding judgment threshold, and if so, determine that the quantum bit state of the frequency point is 0 state.

[0073] Specifically, the quantum state judgment module can be used to judge the quantum state bit state of each quantum bit based on the quantum bit value obtained after eliminating interference. Exemplarily, a judgment threshold can be set in advance. Different judgment thresholds can be set for quantum bits corresponding to different frequency points. The quantum bit value is compared with the corresponding judgment threshold respectively. When the quantum bit value is greater than the judgment threshold, it can be determined that the quantum bit state is 0 state. Correspondingly, when the quantum bit value is less than the judgment threshold, it can be determined that the quantum bit state is 1 state, thereby realizing the determination of the quantum bit state based on the quantum bit value.

[0074] The embodiment of the present invention uses a rotation unit to convert the coordinate system of the quantum bits composed of the real part integration result and the imaginary part integration result according to a preset angle, thereby improving the convenience of the calculation process and reducing the amount of calculation; the interference signal corresponding to each frequency point of the microwave signal is determined through a state processing module, and each quantum bit value is de-interfered, thereby solving the crosstalk between the quantum bits in the microwave signal and improving the accuracy and effectiveness of the quantum bit control process.

[0075] Embodiment 4

[0076] The embodiments corresponding to the quantum manipulation feedback system are described in detail above. In order to make the technical scheme of the present method further clear to those skilled in the art, it is explained below in combination with specific application scenarios. Figure 4 A structural diagram of another quantum manipulation feedback system provided by an embodiment of the present invention. The explanations of terms that are the same as or corresponding to the above embodiments are not repeated here.

[0077] like Figure 4 As shown, DAC (digital-to-analog converter) is used to convert digital signals into analog signals for output.

[0078] ADC (digital-to-analog converter) is used to convert analog signals into digital signals for output.

[0079] The oven-controlled crystal oscillator is used to provide a stable time reference for the system.

[0080] The network port is an integrated network port control chip used for data communication of network communication.

[0081] DDR3, used to provide waveform storage space, Figure 4 DDR3 is provided in the system to provide 4GB of large-capacity waveform storage space.

[0082] The differential amplifier is used to condition and amplify the arbitrary waveform generated by the system to meet the signal amplitude requirements of the receiving end.

[0083] The preamplifier is used to condition and amplify the collected signal to meet the input range of the analog-to-digital converter.

[0084] Data processing / analysis module: used to parse the received data into parameters and waveform data according to its data format, send the waveform data to the DDR3 controller for caching, transmit the parameters to the corresponding positions of each module to control the operation of the entire system, and return the collected signals to the host computer through the network port module in sequence.

[0085] The trigger module is used to receive external trigger signals to make the system work, and can also trigger the work through internal triggering.

[0086] The clock module is used to provide the system with a working clock.

[0087] DDR3 controller: used to cache the preset waveform data for manipulating quantum bits, take it out during operation and send it to the AWG waveform generation module to convert it into a digital waveform that can be output.

[0088] Network port module: used to analyze the data sent by the host computer based on the communication protocol, and send the collected signals to the host computer. The communication protocol includes the user data protocol.

[0089] The AWG waveform generation module is used to parse the waveform data taken from DDR3 into a digital waveform to be output according to a specific waveform data protocol and then transmit it to the DAC. The waveform data protocol includes the frequency, phase and amplitude of the waveform.

[0090] The ADC acquisition module is used to read the digital waveform converted by the external analog-to-digital converter into the FPGA (Field Programmable Gate Array) in time sequence and cache it. The acquisition module includes a digital-to-analog conversion acquisition module.

[0091] The real-time processing algorithm module includes a digital filtering unit, a digital demodulation unit and an integration unit, which is used to demodulate the signals at each frequency point in the collected microwave signal to obtain its phase and amplitude information. Specifically, the digital filtering module is a FIR low-pass filter with a configurable filtering bandwidth, which can filter the input signal and filter out the harmonics and stray signals superimposed on the microwave signal.

[0092] The state processing / judgment module includes a rotation unit, a crosstalk elimination unit and a state judgment unit. The rotation module rotates the quantum bit obtained by the integration unit on the complex plane to obtain the quantum bit value corresponding to the quantum state 1 and the quantum state 0. The crosstalk elimination unit is used to eliminate the crosstalk between the coupled quantum bits on the same quantum reading line through matrix operations. The quantum state judgment unit is used to determine the corresponding quantum bit state according to the quantum bit value after crosstalk elimination, so that the quantum bit state can be sent to the waveform generation module to achieve fast waveform feedback.

[0093] Optionally, the signal analysis module and the state processing module are integrated in the same field programmable logic gate array. Since they are integrated in the same field programmable logic gate array, the waveform output can be switched and adjusted instantly according to the judgment result of the quantum state, so as to realize fast feedback control.

[0094] The quantum manipulation feedback system provided by the embodiment of the present invention prevents crosstalk between quantum bits in microwave signals, thereby improving the accuracy and effectiveness of the quantum bit control process.

[0095] Embodiment 5

[0096] Figure 5 The flowchart of the quantum manipulation feedback method provided in the embodiment of the present invention belongs to the same inventive concept as the quantum manipulation feedback system of each of the above embodiments. For details not described in detail in the embodiment of the quantum manipulation feedback method, reference can be made to the embodiment of the above quantum manipulation feedback system. The method is applied to a quantum manipulation feedback system composed of a signal analysis module, a state processing module and a waveform generation module, including:

[0097] S101, reading the microwave signal generated by the superconducting quantum chip for characterizing the quantum bit state through the signal analysis module, analyzing the quantum bit value of each frequency point contained in the microwave signal, and sending each quantum bit value to the state processing module.

[0098] S102, receiving each quantum bit value through the state processing module, determining the interference signal corresponding to each frequency point of the microwave signal, performing de-interference processing on each quantum bit value based on each interference signal, determining the quantum bit state of each frequency point based on the quantum bit value obtained after the de-interference processing, and sending the quantum bit state of each frequency point to the waveform generation module.

[0099] S103, receiving the quantum bit state at each frequency point through the waveform generation module, and outputting a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip.

[0100] On the basis of any optional technical solution in the embodiments of the present invention, it is optional to include: demodulating the real signal and the imaginary signal corresponding to the microwave signal respectively by a digital demodulation unit to generate a real frequency signal and an imaginary frequency signal corresponding to each frequency point; obtaining the real frequency signal and the imaginary frequency signal corresponding to each frequency point by an integration unit, performing time domain integration calculation on the real frequency signal and the imaginary frequency signal, and obtaining the real integral result and the imaginary integral result corresponding to each frequency point; wherein the quantum bit value is composed of the real integral result and the imaginary integral result, and the time domain integration time length is the acquisition time length of the microwave signal.

[0101] On the basis of any optional technical solution in the embodiments of the present invention, optionally, it includes: performing low-pass filtering on the microwave signal according to a preset filtering bandwidth through a digital filtering unit, and updating the microwave signal.

[0102] Based on any optional technical solution in the embodiments of the present invention, optionally, it includes: performing coordinate system conversion on the quantum bits composed of the real part integration result and the imaginary part integration result according to a preset angle through a rotation unit so that the imaginary part integration result is 0.

[0103] Based on any optional technical solution in the embodiments of the present invention, optionally, the following further includes:

[0104] The crosstalk elimination unit calculates the total interference value of each frequency point based on the interference signals at each frequency point, determines the compensation matrix corresponding to each frequency point based on the total interference value, and multiplies the compensation matrix with the real part integral result of each frequency point obtained after the coordinate system is converted to obtain the quantum bit value after interference elimination processing.

[0105] Based on any optional technical solution in the embodiments of the present invention, optionally, the following further includes:

[0106] The quantum state judgment module obtains the judgment threshold corresponding to each frequency point to determine whether the quantum bit value corresponding to each frequency point is greater than the corresponding judgment threshold. If so, the quantum bit state of the frequency point is determined to be 0 state.

[0107] Based on any optional technical solution in the embodiments of the present invention, the optional solutions include:

[0108] The waveform parameter acquisition unit determines the pre-set waveform parameters corresponding to the quantum bit states based on the received quantum bit states at each frequency point, and outputs a digital waveform according to the waveform parameters to perform feedback control on the quantum chip.

[0109] Based on any optional technical solution in the embodiments of the present invention, optionally, the waveform parameters include frequency, phase and amplitude of the digital waveform.

[0110] Based on any optional technical solution in the embodiments of the present invention, optionally, the signal analysis module and the state processing module are integrated into the same field programmable logic gate array.

[0111] The quantum manipulation feedback method provided in the embodiment of the present invention reads the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit through the signal analysis module, analyzes the quantum bit value of each frequency point contained in the microwave signal, and sends each quantum bit value to the state processing module; the interference signal corresponding to each frequency point of the microwave signal is determined by the state processing module, and each quantum bit value is de-interfered based on each interference signal, and the quantum bit state of each frequency point is determined based on the quantum bit value obtained after the de-interference processing, and the quantum bit state of each frequency point is sent to the waveform generation module; and the waveform generation module outputs the digital waveform corresponding to the quantum bit state to feedback control the quantum chip. The crosstalk between the quantum bits in the microwave signal is solved, and the accuracy and effectiveness of the quantum bit control process are improved.

[0112] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A quantum manipulation feedback system, characterized in that: include: Signal analysis module, state processing module and waveform generation module; among them, A signal analysis module, used to read the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit, analyze the quantum bit value of each frequency point contained in the microwave signal, and send each of the quantum bit values ​​to the state processing module; a state processing module, configured to receive each of the qubit values, determine the interference signal corresponding to each of the frequency points of the microwave signal, perform interference removal processing on each of the qubit values ​​based on each of the interference signals, determine the qubit state of each of the frequency points based on the qubit value obtained after the interference removal processing, and send the qubit state of each of the frequency points to the waveform generation module; A waveform generation module, configured to receive the quantum bit state at each frequency point and output a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip; The state processing module further includes: A crosstalk elimination unit is used to calculate the total interference value of each frequency point based on the interference signals of each frequency point, determine the compensation matrix corresponding to each frequency point based on the total interference value, and multiply the compensation matrix with the real part integral result of each frequency point obtained after the coordinate system is converted to obtain the quantum bit value after interference elimination processing.

2. The system according to claim 1, characterized in that The signal analysis module comprises: A digital demodulation unit, used to demodulate the real signal and the imaginary signal corresponding to the microwave signal respectively, to generate a real frequency signal and an imaginary frequency signal corresponding to each frequency point; An integration unit is used to obtain the real frequency signal and the imaginary frequency signal corresponding to each frequency point, and perform time domain integration calculation on the real frequency signal and the imaginary frequency signal to obtain the real part integration result and the imaginary part integration result corresponding to each frequency point; wherein the quantum bit value is composed of the real part integration result and the imaginary part integration result, and the time domain integration time length is the acquisition time length of the microwave signal.

3. The system according to claim 1, characterized in that The signal analysis module comprises: The digital filtering unit is used to perform low-pass filtering on the microwave signal according to a preset filtering bandwidth and update the microwave signal.

4. The system according to claim 2, characterized in that The state processing module includes: A rotation unit is used to perform coordinate system conversion on the quantum bits composed of the real part integration result and the imaginary part integration result according to a preset angle so that the imaginary part integration result is 0.

5. The system according to claim 1, characterized in that The state processing module further includes: The quantum state judgment module is used to obtain the judgment threshold corresponding to each frequency point, determine whether the quantum bit value corresponding to each frequency point is greater than the corresponding judgment threshold, and if so, determine that the quantum bit state of the frequency point is 0 state.

6. The system according to claim 1, characterized in that The waveform generation module comprises: A waveform parameter acquisition unit is used to determine the preset waveform parameters corresponding to each of the quantum bit states based on the received quantum bit states at each of the frequency points, and output the digital waveform according to each of the waveform parameters to feedback control the quantum chip.

7. The system according to claim 6, characterized in that The waveform parameters include the frequency, phase and amplitude of the digital waveform.

8. The system according to claim 1, characterized in that The signal analysis module and the state processing module are integrated into the same field programmable logic gate array.

9. A quantum manipulation feedback method, characterized in that: Applied to the quantum manipulation feedback system consisting of a signal analysis module, a state processing module, and a waveform generation module, including: The signal analysis module reads the microwave signal generated by the superconducting quantum chip for characterizing the state of the quantum bit, analyzes the quantum bit value of each frequency point contained in the microwave signal, and sends each of the quantum bit values ​​to the state processing module; Receive each of the qubit values ​​through a state processing module, determine the interference signal corresponding to each of the frequency points of the microwave signal, perform interference removal processing on each of the qubit values ​​based on each of the interference signals, determine the qubit state of each of the frequency points based on the qubit value obtained after the interference removal processing, and send the qubit state of each of the frequency points to the waveform generation module; The waveform generation module receives the quantum bit state at each frequency point, and outputs a digital waveform corresponding to the quantum bit state to perform feedback control on the quantum chip; The step of performing interference removal processing on each of the quantum bit values ​​based on each of the interference signals includes: The crosstalk elimination unit calculates the total interference value of each frequency point based on the interference signals at each frequency point, determines the compensation matrix corresponding to each frequency point based on the total interference value, and multiplies the compensation matrix with the real part integral result of each frequency point obtained after the coordinate system is converted to obtain the quantum bit value after interference elimination processing.

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