Quantum control feedback system and method

A feedback system, quantum technology, applied in the field of quantum control feedback system, to achieve the effect of solving crosstalk, improving accuracy and effectiveness

Pending Publication Date: 2022-02-11
CHINAINSTRU & QUANTUMTECH (HEFEI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a quantum control feedback system and method to solve the crosstalk between the qubits in the microwave signal and improve the accuracy and effectiveness of the process of controlling the qubits

Method used

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  • Quantum control feedback system and method

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Embodiment 1

[0025] figure 1 A structural diagram of a quantum manipulation feedback system provided by an embodiment of the present invention. like figure 1 As shown, the system in 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 qubit, analyze the qubit value of each frequency point contained in the microwave signal, and send each qubit 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 After the intermediate frequency sign...

Embodiment 2

[0035] figure 2 The structural diagram of the signal analysis module provided for the embodiment of the present invention, such as 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 for low-pass filtering the microwave signal according to the preset filtering bandwidth, and updating the microwave signal. Those skilled in the art can determine the specific value of the filtering bandwidth according to actual application conditions. The digital filter unit provided by the embodiment of the present invention filters out harmonic signals and spurious signals superimposed on microwave signals.

[0037] Exemplarily, the digital filtering unit includes a real part filtering unit and an imaginary part filtering unit; the real part filtering unit is used for performing low-pass filtering processing on the real part signal, and the imaginary part filtering unit is used fo...

Embodiment 3

[0054] image 3 The structural diagram of the state processing module provided for the embodiment of the present invention, such as image 3 Shown, optional, state processing modules, including:

[0055] The rotation unit is used to transform the coordinate system of the qubit 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, when the qubit is in the coordinate system, the integration result of the real part can be used as the data of the real axis of the coordinate system, and the result of the integration of the imaginary part can be used as the data of the imaginary axis. The result of the integration is determined directly as a qubit value. At this time, the real part integral result can represent the magnitude of the modulus value of the signal corresponding to the frequency point of the qubit, thus avoiding the determination of the qubit value thro...

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Abstract

The embodiment of the invention discloses a quantum control feedback system and method. The method comprises the following steps: reading a microwave signal which is generated by a superconducting quantum chip and is used for representing a quantum bit state through a signal analysis module, analyzing the quantum bit value of each frequency point in the microwave signal, and transmitting each quantum bit value to a state processing module; an interference signal corresponding to each frequency point of the microwave signal is determined through a state processing module, interference removal processing is performed on each quantum bit value based on each interference signal, a quantum bit state of each frequency point is determined based on the quantum bit value obtained after interference removal processing, and the quantum bit state of each frequency point is sent to a waveform generation module; and the waveform generation module outputs a digital waveform corresponding to the quantum bit state so as to carry out feedback control on the quantum chip, so that crosstalk among the quantum bits in the microwave signal is solved, and the accuracy and effectiveness of the quantum bit control process are improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of quantum computing, and in particular to a quantum manipulation feedback system and method. Background technique [0002] Superconducting quantum computing requires a measurement and control system to control the qubits. The quantum control feedback system is a crucial component of the superconducting quantum computing measurement and control system, which can read the quantum state and control the status of the quantum chip based on the reading results. Control and Feedback. [0003] At present, in the prior art, physical qubits are measured through a measurement and control network composed of multiple measurement and control subgroups to obtain the quantum states corresponding to the physical qubits, and control instructions are sent based on the quantum states to control the physical qubits. However, the control process in the prior art does not take into account the crosstal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N10/80
CPCG06N10/00
Inventor 王淋张俊斌吴亚
Owner CHINAINSTRU & QUANTUMTECH (HEFEI) CO LTD
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