CN116402150A - Test calibration method of quantum computer - Google Patents
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Abstract
The application discloses a test calibration method of a quantum computer, wherein the quantum computer comprises a quantum processor and a quantum controller which are connected through a communication link, and a user terminal which is connected with the quantum controller through a network, and the test method comprises the following steps: determining intrinsic parameters of all quantum bits on a quantum processor to be measured, and determining the quantum processor of which the intrinsic parameters of all the quantum bits meet preset values as a target quantum processor; setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, and calibrating a quantum logic gate applied to each qubit; calibrating a joint reading criterion based on the result of each quantum bit operation quantum logic gate on the target quantum processor; and sending the calibrated parameters of the quantum logic gate and the joint reading criteria to the user terminal. The application makes up for the blank of the prior art.
Description
Technical Field
The application belongs to the field of quanta, in particular to a test calibration method of a quantum computer.
Background
The quantum computer is a kind of physical device which performs high-speed mathematical and logical operation, stores and processes quantum information according to the law of quantum mechanics. The quantum computer has the characteristics of higher running speed, stronger information processing capability, wider application range and the like. Compared with a general computer, the more the information processing amount is, the more the quantum computer is beneficial to the operation, and the accuracy of the operation can be ensured.
The quantum processor is a core component for executing calculation of the quantum computer, and when the quantum computer is assembled, the intrinsic parameters of the quantum processor need to be tested, and the quantum processor with the screening intrinsic parameters conforming to preset values is loaded on the quantum computer. After the quantum processor is loaded into the quantum computer, the regulation and control parameters of the quantum processor are required to be calibrated through a complete machine system of the quantum computer, in addition, the joint reading criteria for simultaneously measuring the quantum state information of a plurality of quantum bits are also required to be calibrated, and the calibrated regulation and control parameters and the joint reading criteria are stored and are used for being called when quantum computing tasks are executed. The inherent parameter test result, the regulation and control parameters of the quantum processor and the calibration effect of the combined reading criteria directly influence the accuracy of the quantum computer in executing calculation. Therefore, how to test the intrinsic parameters of the quantum computer and calibrate the modulation parameters and the combined reading criteria is a problem to be solved in the present day.
Disclosure of Invention
The purpose of the application is to provide a test calibration method of a quantum computer, so as to solve the defects that inherent parameters of the quantum computer cannot be tested, parameters cannot be regulated and controlled and combined reading criteria cannot be calibrated in the prior art, and make up for the blank of the prior art.
An aspect of the present application provides a test calibration method of a quantum computer, the quantum computer including a quantum processor and a quantum controller connected through a communication link, and a user terminal connected to the quantum controller through a network, the test method including:
determining intrinsic parameters of all quantum bits on a quantum processor to be measured, and determining the quantum processor of which the intrinsic parameters of all the quantum bits meet preset values as a target quantum processor; wherein the intrinsic parameters include degenerate point frequency, relaxation time, and decoherence time, the degenerate point frequencies of adjacent qubits being different;
setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, and calibrating a quantum logic gate applied to each qubit; wherein the operating point frequency is set according to the degenerate point frequency; the quantum logic gate is an information logic gate obtained by applying a control signal output by the quantum controller to the qubit;
calibrating a joint reading criterion based on the result of each quantum bit operating the quantum logic gate on the target quantum processor, wherein the joint reading criterion is used for judging quantum state information when a plurality of quantum bits simultaneously operate the quantum logic gate;
and sending the calibrated parameters of the quantum logic gate and the joint reading criteria to the user terminal.
The method for testing and calibrating the quantum computer further comprises the step of determining the inherent parameters of each quantum bit on the quantum processor to be measured, wherein the method specifically comprises the following steps:
the quantum controller outputs a direct current control signal to each quantum bit to obtain the maximum working frequency of a reading cavity in coupling connection with each quantum bit and a corresponding first direct current control signal;
obtaining degenerate point frequency, relaxation time, decoherence time and non-harmonic parameters of each qubit when the quantum controller outputs a first direct current control signal to each qubit.
The method for calibrating the quantum computer test as described above, further, the determining the intrinsic parameters of each qubit on the quantum processor to be measured, further includes: taking the qubit as a unit, obtaining a first direct current control signal, the maximum working frequency of a reading cavity, the degenerate point frequency of the qubit, the relaxation time, the decoherence time and the non-harmonic parameters.
The method for testing and calibrating the quantum computer further comprises the steps of after determining the quantum processor with the intrinsic parameters of each quantum bit meeting preset values as the target quantum processor, wherein the method comprises the following steps: measuring a direct current spectrum and a pulse spectrum of each qubit on the target quantum processor; the direct current spectrum is a curve of the working frequency of the quantum bit changing along with the direct current control signal output by the quantum controller, and the pulse spectrum is a curve of the working frequency of the quantum bit changing along with the pulse control signal output by the quantum controller.
The method for calibrating the quantum computer according to the above further includes, after measuring the dc spectrum and the pulse spectrum of each of the qubits on the target quantum processor: and measuring the delay and crosstalk of the communication link connected by the corresponding qubit based on the direct current spectrum and the pulse spectrum of each qubit.
The test calibration method of the quantum computer further comprises the following steps: calibrating the frequency of the working point of each qubit every first time based on the direct current spectrum of each qubit, wherein the first time is preset time.
The method for calibrating the test of the quantum computer as described above, further, the calibrating the working point frequency of each of the qubits based on the direct current spectrum of each of the qubits specifically includes:
obtaining a working frequency measurement value of the qubit when the quantum controller outputs a second direct current signal to the qubit; wherein the second direct current signal corresponds to the working point frequency;
and when the deviation between the working frequency measured value and the working point frequency is larger than a preset deviation value, adjusting a second direct current control signal output by the quantum controller based on the direct current spectrum of each quantum bit.
The test calibration method of the quantum computer, further, the quantum logic gate comprises a single quantum logic gate and two quantum logic gates, and the calibration is applied to the quantum logic gate of each quantum bit, and specifically comprises the following steps:
setting the working frequency of each qubit at the frequency of the working point, and adjusting the parameters of control signals corresponding to the single quantum logic gates, which are output to each qubit by the quantum controller, so that the fidelity measured value of the single quantum logic gates reaches a preset threshold;
setting the working frequency of one qubit at a single-bit working point frequency, setting the working frequency of the adjacent qubit at a two-bit working point frequency, and adjusting parameters of control signals corresponding to two quantum logic gates output to two qubits by the quantum controller so that the fidelity measured value of the two quantum logic gates reaches a preset threshold; the single-bit working point frequency is the working point frequency of the qubit, and the two-bit working point frequency is the sum of the single-bit working point frequency and the non-harmonic parameter.
The method for testing and calibrating the quantum computer further comprises the steps of after the calibrated parameters of the single quantum logic gate, the parameters of the two quantum logic gates and the combined reading criterion are sent to the user terminal:
determining communication parameters between the quantum controller and the user terminal based on parameters of the quantum logic gate; wherein the communication parameters include control signal parameters, timing parameters, and bit information of the quantum logic gate.
Compared with the prior art, the method and the device have the advantages that the intrinsic parameters of all the quantum bits on the quantum processor to be measured are measured firstly, and the quantum processor, of which the intrinsic parameters all accord with preset values, is determined to be a target quantum processor and is loaded in a quantum computer; setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, calibrating a quantum logic gate applied to each qubit, and realizing the calibration of the regulation parameters of the qubit; and then each qubit on the target quantum processor operates the single-quantum logic gate or/and the two-quantum logic gate, and the combination reading criterion is calibrated based on the operation result of the qubit; and finally, the calibrated parameters of the single quantum logic gate, the parameters of the two quantum logic gates and the combined reading criterion are sent to the user terminal for the user terminal to compile the quantum computing task to be executed. The application provides a testing and calibrating method of a quantum computer, which fills the blank of the prior art.
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Fig. 1 is a flowchart of a test calibration method of a quantum computer according to an embodiment of the present application;
FIG. 2 is a flow chart for calibrating the operating point frequency of quantum bit according to an embodiment of the present application;
fig. 3 is a flow chart of a calibration quantum logic gate according to an embodiment.
Detailed Description
The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
The embodiment of the application provides a test calibration method of a quantum computer, wherein the quantum computer comprises a quantum processor and a quantum controller which are connected through a communication link, and a user terminal which is connected with the quantum controller through a network, and the test calibration method comprises the following steps:
s10: determining intrinsic parameters of all quantum bits on a quantum processor to be measured, and determining the quantum processor of which the intrinsic parameters of all the quantum bits meet preset values as a target quantum processor; the intrinsic parameters include degenerate point frequencies, relaxation times, and decoherence times, wherein the degenerate point frequencies of adjacent qubits differ.
The quantum processor is loaded in the quantum computer to run the quantum computing task, and for the prepared quantum processor, the prepared quantum processor needs to be loaded in the quantum computer, the intrinsic parameters of the quantum processor are tested, specifically, the intrinsic parameters of each quantum bit on the quantum processor are tested, and when the intrinsic parameters of each quantum bit accord with the preset value, the quantum processor can be determined to be loaded in the quantum computer to run the quantum computing task for the target quantum processor. The intrinsic parameters of the qubit comprise degenerate point frequency, relaxation time, decoherence time and the like, and the degenerate point frequency is the working point frequency which is insensitive to the regulation and control of the frequency of a single qubit along with a control signal, so that when the qubit works at the degenerate point frequency, the working performance of the qubit is more stable.
The quantum processor has the advantages that the frequency of all the qubits has the high degenerate point frequency and the low degenerate point frequency, wherein the qubits with the high degenerate point frequency and the low degenerate point frequency are adjacently arranged, namely, the degenerate point frequencies of adjacent qubits are different, and the crosstalk effect between the adjacent qubits is reduced.
S20: setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, and calibrating a quantum logic gate applied to each qubit; wherein the operating point frequency is set according to the degenerate point frequency; the quantum logic gate is an information logic gate obtained by applying a control signal output by the quantum controller to the qubit.
When a target quantum processor is loaded into a quantum computer to run a quantum computing task, various quantum logic gates, such as a single quantum logic gate and/or a two quantum logic gate, need to be applied to the qubit running the computing task on the quantum processor. The single quantum logic gate is an information logic gate obtained by applying a control signal output by the quantum controller to a single quantum bit, and the two quantum logic gates are information logic gates obtained by applying a control signal output by the quantum controller to two adjacent quantum bits. The precision of the control signal corresponding to each quantum logic gate can directly influence the precision of the quantum bit operation calculation task, and the precision of the quantum processor operation calculation task can be improved and the stability of the working performance of a quantum computer can be ensured through calibrating the quantum logic gate applied to each quantum bit on the target quantum processor.
In addition, when the quantum logic gate applied to each quantum bit is calibrated, not only the frequency of the quantum bit is set at the working point frequency, but also the frequencies of other quantum bits are set at the respective working point frequencies, so that the crosstalk effect of the other quantum bits on the quantum bit is ensured to be standardized through calibration, and further, the crosstalk among all the quantum bits on the target quantum processor is prevented from reducing the precision of the quantum logic gate. It should be noted that the working point frequency may be a degenerate point frequency or a working point frequency near the degenerate point. In practice, degenerate point frequencies are preferred.
S30: and calibrating a joint reading criterion based on the result of each quantum bit operating the quantum logic gate on the target quantum processor, wherein the joint reading criterion is used for judging quantum state information when a plurality of quantum bits simultaneously operate the quantum logic gate.
The quantum processor is integrated with a plurality of quantum bits, and the plurality of quantum bits can simultaneously execute one or more quantum calculation tasks, so that operation results of the plurality of quantum bits can be simultaneously read during reading, specifically, analog signals carrying quantum state information output by the quantum processor are demodulated to obtain IQ data of a plurality of quantum bits, the IQ data are resolved by means of joint reading criteria to obtain quantum states of the plurality of quantum bits, and therefore, the accuracy of the joint reading criteria can directly influence the accuracy of the obtained quantum state information, and the reading accuracy of the quantum state information of the quantum bits can be improved by calibrating the joint reading criteria of the quantum bits.
S40: and sending the calibrated parameters of the quantum logic gate and the joint reading criteria to the user terminal. The user terminal compiles a quantum computing task to be executed based on the calibrated parameters of the quantum logic gate, and obtains a task result based on the joint reading criterion, so that the running precision of the quantum computer can be ensured.
Firstly, measuring inherent parameters of each quantum bit on a quantum processor to be measured, and determining the quantum processor of which the inherent parameters all accord with preset values as a target quantum processor to be loaded in a quantum computer; setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, calibrating a quantum logic gate applied to each qubit, and realizing the calibration of the regulation parameters of the qubit; further, each qubit on the target quantum processor operates the quantum logic gate, and the combination reading criterion is calibrated based on the operation result of the qubit; and finally, the calibrated parameters of the single quantum logic gate and the combined reading criteria are sent to the user terminal for the user terminal to compile the quantum computing task to be executed and obtain a corresponding task result. The application provides a testing and calibrating method of a quantum computer, which makes up the blank of the prior art.
As an implementation manner of the embodiment of the present application, the determining the intrinsic parameters of each qubit on the quantum processor to be measured specifically includes: the quantum controller outputs a direct current control signal to each quantum bit to obtain the maximum working frequency of a reading cavity in coupling connection with each quantum bit and a corresponding first direct current control signal; and obtaining degenerate point frequency, relaxation time, decoherence time and non-harmonic parameters of the quantum bit when the quantum controller outputs a first direct current control signal to each quantum bit.
Each qubit on the quantum processor is coupled and linked with a reading cavity for reading information of the qubit. Specifically, when the information of the qubit changes along with the change of the applied regulation and control parameters, the working frequency of a reading cavity coupled with the qubit also changes, and the information change of the qubit can be obtained by measuring the working frequency change of the reading cavity. By way of example, a direct current control signal for regulating the operating frequency is applied to the qubit, and a plurality of voltage values of the direct current control signal are traversed, the operating frequency of the qubit varies with the traversed direct current control signal, and the operating frequency of the read cavity also varies with the operating frequency of the qubit. When the working frequency of the reading cavity is at the maximum value, the working frequency of the qubit is also at the maximum value, and the voltage value of the corresponding direct current control signal is obtained at the moment and is determined to be the first direct current control signal.
When the control signal output to the quantum bit is the first direct current control signal, the working frequency of the quantum bit is at the maximum value, namely, the working frequency of the quantum bit is at an insensitive point, and degenerate point frequency, relaxation time, decoherence time and non-harmonic parameters of the quantum bit can be obtained through testing.
As an implementation manner of the embodiment of the present application, the determining the intrinsic parameters of each qubit on the quantum processor to be measured further includes: taking the qubit as a unit, obtaining a first direct current control signal, the maximum working frequency of a reading cavity, the degenerate point frequency of the qubit, the relaxation time, the decoherence time and the non-harmonic parameters.
When the current quantum processor is determined to be a target quantum processor through testing, taking the quantum bit as a unit, forming a record or storing a configuration file by using a first direct current control signal corresponding to each quantum bit, the maximum working frequency of a reading cavity, the degenerate point frequency of the quantum bit, the relaxation time, the decoherence time and the non-harmonic parameters for later test calibration or calling in work.
As one implementation manner of the embodiment of the present application, after determining, as the target quantum processor, a quantum processor in which the intrinsic parameters of each qubit meet preset values, further includes: measuring a direct current spectrum and a pulse spectrum of each qubit on the target quantum processor; the direct current spectrum is a curve of the working frequency of the quantum bit changing along with the direct current control signal output by the quantum controller, and the pulse spectrum is a curve of the working frequency of the quantum bit changing along with the pulse control signal output by the quantum controller.
The working frequency of the qubit can be regulated and controlled by a direct current control signal output by the quantum controller, and also can be regulated and controlled by a pulse control signal. Specifically, when a single quantum logic gate is applied to an equivalent bit, the single quantum logic gate is regulated and controlled by a direct current control signal, and when two quantum logic gates are applied to the equivalent bit, the single quantum logic gate is regulated and controlled by a pulse signal. The direct current spectrum and the pulse spectrum can be obtained by traversing the direct current control signal and the pulse control signal output by the quantum controller respectively and measuring the working frequency change of the quantum bit respectively, and then the method is used for testing and calibrating the quantum computer.
As an implementation manner of the embodiment of the present application, after measuring the dc spectrum and the pulse spectrum of each qubit on the target quantum processor, the method further includes: and measuring the delay and crosstalk of the communication link connected by the corresponding qubit based on the direct current spectrum and the pulse spectrum of each qubit.
Specifically, each quantum bit on the quantum processor is connected with the quantum controller through an equal communication link, the number of the equivalent quantum bits is increased, the number of the communication links is correspondingly increased, crosstalk exists among a plurality of communication links, and then control signals transmitted on each communication link are affected. And the multiple communication links have different link lengths, so that delay occurs among the multiple transmitted control signals, and the control effect on the qubit is affected. The delay and crosstalk of each communication link are measured by applying a direct current control signal or a pulse control signal on the target communication link based on a direct current spectrum or a pulse spectrum and applying a direct current control signal and/or a pulse control signal on other crosstalk communication links or delay communication links based on the direct current spectrum and the pulse spectrum, and the delay and crosstalk of each communication link are compensated according to the measurement result, so that the regulation and control precision of the control signal transmitted on each communication link is ensured.
As an implementation manner of the embodiment of the present application, the test calibration method of the quantum computer further includes: calibrating the frequency of the working point of each qubit every first time based on the direct current spectrum of each qubit, wherein the first time is preset time. The quantum processor is sensitive to environmental influences, such as electromagnetic fields, thermal radiation, infrared rays and the like, and the regulation precision of the regulation parameters on the quantum processor can be influenced. For example, when the quantum controller outputs a dc control signal to a qubit on the quantum processor, the operating frequency of the qubit is not at the operating point frequency and may deviate from the operating point frequency due to environmental effects. A tolerance value is usually set for the frequency deviation of the qubit, and within the tolerance value, the qubit can be judged to work normally; outside the tolerance value, the qubit is determined to need to be calibrated. Calibrating the working point frequency of each qubit at each first time interval to ensure that the measuring frequency of each qubit is at the working point frequency, thereby ensuring the calculation accuracy of the quantum processor.
As an implementation manner of the embodiment of the present application, the calibrating the operating point frequency of each qubit based on the dc spectrum and the pulse spectrum of each qubit specifically includes:
s100: obtaining a working frequency measurement value of the qubit when the quantum controller outputs a second direct current signal to the qubit; wherein the second direct current signal corresponds to the operating point frequency.
S200: and when the deviation between the working frequency measured value and the working point frequency is larger than a preset deviation value, adjusting a second direct current control signal output by the quantum controller based on the direct current spectrum of each quantum bit.
Specifically, a second direct current control signal corresponding to the frequency of the working point is output through the quantum controller, the working frequency measured value of the quantum bit at the moment is measured, and whether the deviation between the measured value and the frequency of the working point is larger than a preset deviation value is judged. When the deviation between the measured value and the working point frequency is larger than a preset deviation value, the quantum bit is required to be calibrated, and a second direct current control signal output by the quantum controller is adjusted based on the direct current frequency spectrum of each quantum bit, so that when the quantum controller outputs the adjusted second direct current control signal to the quantum bit, the working frequency of the quantum bit is at the working point frequency, and the calculation accuracy of the quantum bit is ensured.
As one implementation of the embodiment of the present application, the quantum logic gate includes a single quantum logic gate and two quantum logic gates, and the calibrating is applied to the quantum logic gate of each qubit, specifically including:
s301: setting the working frequency of each qubit at the frequency of the working point, and adjusting the parameters of control signals corresponding to the single quantum logic gates, which are output to each qubit by the quantum controller, so that the fidelity measured value of the single quantum logic gates reaches a preset threshold.
S302: setting the working frequency of one qubit at a single-bit working point frequency, setting the working frequency of the adjacent qubit at a two-bit working point frequency, and adjusting parameters of control signals corresponding to two quantum logic gates output to two qubits by the quantum controller so that the fidelity measured value of the two quantum logic gates reaches a preset threshold; the single-bit working point frequency is the working point frequency of the qubit, and the two-bit working point frequency is the sum of the single-bit working point frequency and the non-harmonic parameter.
The single quantum logic gate is an information logic gate obtained by applying a control signal to the quantum bit when the single quantum bit runs a quantum computing task, when the parameters of the control signal corresponding to the single quantum logic gate are calibrated, the working frequency of the quantum bit is set at the working point frequency, the working frequencies of other quantum bits are also set at the corresponding working point frequencies, and the crosstalk effect of the quantum bit by the other quantum bits is ensured to be standardized through calibration. And the fidelity measured value of the single quantum logic gate reaches a preset threshold value by adjusting the parameters of the control signals corresponding to the single quantum logic gate output by the quantum controller.
Correspondingly, the two quantum logic gates are information logic gates obtained by applying control signals to the two quantum bits when two adjacent quantum bits operate quantum computing tasks, when parameters of the control signals corresponding to the two quantum logic gates are calibrated, the working frequency of one of the two adjacent quantum bits is set at the single-bit working point frequency, the working frequency of the other one of the two adjacent quantum bits is set at the two-bit working point frequency, wherein the two-bit working point frequency is the sum of the single-bit working point frequency and the non-harmonic parameters, the working frequencies of the two adjacent quantum bits are ensured to be similar, and the coupling effect can be achieved. And the fidelity measured value of the two quantum logic gates reaches a preset threshold value by adjusting the parameters of the control signals corresponding to the two quantum logic gates output by the quantum controller.
The accuracy of a quantum logic gate is generally measured by fidelity, that is, the higher the fidelity, the higher the accuracy of the quantum logic gate in regulating the qubit after the quantum logic gate is applied to the qubit, the current information of the qubit is consistent with the preset information. The parameters of the control signals corresponding to the single quantum logic gate and/or the two quantum logic gates applied to each quantum bit are calibrated, so that the fidelity of the calibrated quantum logic gate is ensured to meet the calculation requirement of a quantum computer.
As an implementation manner of the embodiment of the present application, after sending the calibrated parameters of the quantum logic gate and the joint reading criterion to the user terminal, the method further includes: determining communication parameters between the quantum controller and the user terminal based on parameters of the quantum logic gate; wherein the communication parameters include control signal parameters, timing parameters, and bit information of the quantum logic gate.
The user terminal is used for receiving the quantum computing task to be executed, compiling the quantum computing task based on the parameters of the quantum logic gate to obtain communication parameters, sending the communication parameters obtained after compiling to the quantum controller, and outputting various corresponding control signals to the quantum processor by the quantum controller according to the received communication parameters.
The foregoing detailed description of the construction, features and advantages of the present application will be presented in terms of embodiments illustrated in the drawings, wherein the foregoing description is merely illustrative of preferred embodiments of the application, and the scope of the application is not limited to the embodiments illustrated in the drawings.
Claims (9)
1. A test calibration method of a quantum computer, wherein the quantum computer comprises a quantum processor and a quantum controller connected through a communication link, and a user terminal connected with the quantum controller through a network, the test method comprising:
determining intrinsic parameters of all quantum bits on a quantum processor to be measured, and determining the quantum processor of which the intrinsic parameters of all the quantum bits meet preset values as a target quantum processor; wherein the intrinsic parameters include degenerate point frequency, relaxation time, and decoherence time, the degenerate point frequencies of adjacent qubits being different;
setting the frequency of all the qubits on the target quantum processor to the frequency of a working point, and calibrating a quantum logic gate applied to each qubit; wherein the operating point frequency is set according to the degenerate point frequency; the quantum logic gate is an information logic gate obtained by applying a control signal output by the quantum controller to the qubit;
calibrating a joint reading criterion based on the result of each quantum bit operating the quantum logic gate on the target quantum processor, wherein the joint reading criterion is used for judging quantum state information when a plurality of quantum bits simultaneously operate the quantum logic gate;
and sending the calibrated parameters of the quantum logic gate and the joint reading criteria to the user terminal.
2. The method for calibrating a quantum computer according to claim 1, wherein the determining the intrinsic parameters of each qubit on the quantum processor to be measured specifically comprises:
the quantum controller outputs a direct current control signal to each quantum bit to obtain the maximum working frequency of a reading cavity in coupling connection with each quantum bit and a corresponding first direct current control signal;
obtaining degenerate point frequency, relaxation time, decoherence time and non-harmonic parameters of each qubit when the quantum controller outputs a first direct current control signal to each qubit.
3. The method for calibrating a quantum computer according to claim 2, wherein determining the intrinsic parameters of each qubit on the quantum processor to be measured further comprises: taking the qubit as a unit, obtaining a first direct current control signal, the maximum working frequency of a reading cavity, the degenerate point frequency of the qubit, the relaxation time, the decoherence time and the non-harmonic parameters.
4. The method according to claim 1, wherein after determining as the target quantum processor a quantum processor whose intrinsic parameters of each of the qubits meet preset values, further comprising:
measuring a direct current spectrum and a pulse spectrum of each qubit on the target quantum processor; the direct current spectrum is a curve of the working frequency of the quantum bit changing along with the direct current control signal output by the quantum controller, and the pulse spectrum is a curve of the working frequency of the quantum bit changing along with the pulse control signal output by the quantum controller.
5. The method for calibrating a quantum computer according to claim 4, wherein after measuring the dc spectrum and the pulse spectrum of each qubit on the target quantum processor, the method further comprises:
and measuring the delay and crosstalk of the communication link connected by the corresponding qubit based on the direct current spectrum and the pulse spectrum of each qubit.
6. The method for testing and calibrating a quantum computer of claim 4, further comprising: calibrating the frequency of the working point of each qubit every first time based on the direct current spectrum of each qubit, wherein the first time is preset time.
7. The method for calibrating a quantum computer according to claim 6, wherein the calibrating the operating point frequency of each of the qubits based on the dc spectrum of each of the qubits specifically comprises:
obtaining a working frequency measurement value of the qubit when the quantum controller outputs a second direct current signal to the qubit; wherein the second direct current signal corresponds to the working point frequency;
and when the deviation between the working frequency measured value and the working point frequency is larger than a preset deviation value, adjusting the second direct current control signal output by the quantum controller based on the direct current spectrum of each quantum bit.
8. The method of claim 1, wherein the quantum logic gates comprise a single quantum logic gate and a two quantum logic gate, and the calibration is applied to the quantum logic gate of each qubit, and specifically comprises:
setting the working frequency of each qubit at the frequency of the working point, and adjusting the parameters of control signals corresponding to the single quantum logic gates, which are output to each qubit by the quantum controller, so that the fidelity measured value of the single quantum logic gates reaches a preset threshold;
setting the working frequency of one qubit at a single-bit working point frequency, setting the working frequency of the adjacent qubit at a two-bit working point frequency, and adjusting parameters of control signals corresponding to two quantum logic gates output to two qubits by the quantum controller so that the fidelity measured value of the two quantum logic gates reaches a preset threshold; the single-bit working point frequency is the working point frequency of the qubit, and the two-bit working point frequency is the sum of the single-bit working point frequency and the non-harmonic parameter.
9. The method for calibrating a quantum computer according to claim 1, wherein after the calibrated parameters of the quantum logic gate and the joint reading criteria are sent to the user terminal, further comprising:
determining communication parameters between the quantum controller and the user terminal based on parameters of the quantum logic gate; wherein the communication parameters include control signal parameters, timing parameters, and bit information of the quantum logic gate.
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