Magnetic flux crosstalk calibration method and device, computer equipment and storage medium

Abstract

The invention relates to a magnetic flux crosstalk calibration method and device, computer equipment and a storage medium. The method comprises the steps that N groups of primary frequency tests are carried out on a quantum bit chip, N frequency sets are obtained, each frequency set comprises the measurement frequency of N quantum bits, and then the first magnetic flux crosstalk intensity and the second magnetic flux crosstalk intensity are determined according to a first magnetic flux, a second magnetic flux, the measurement frequency of each quantum bit and a target function, wherein the primary frequency test comprises the steps of inputting a first magnetic flux to a first quantum bit, inputting a second magnetic flux to a second quantum bit, and obtaining a measurement frequency of each quantum bit on a quantum bit chip; the objective function is used for representing the function relationship among the input magnetic flux of the quantum bits, the magnetic flux crosstalk intensity among the quantum bits and the calculation frequency of the quantum bits. Through the above mode, the measurement time magnitude of the measurement frequency is reduced from MN2 to MN, the measurement time consumption is greatly shortened, and the calibration efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of quantum chip measurement, in particular to a calibration method, device, computer equipment and storage medium for magnetic flux crosstalk. Background technique [0002] A qubit is the smallest information unit in quantum computing, and a superconducting qubit is a qubit realized by a superconducting quantum circuit, generally composed of a capacitor and a Josephson junction. With the development of science and technology, in order to improve the computing power of computers, qubit chips integrating multiple superconducting qubits have become the research focus of researchers. Among them, qubits with adjustable frequency have more flexible and wide applications than qubits with fixed frequency. [0003] However, for a qubit chip integrated with frequency-tunable qubits, the magnetic flux applied to a certain qubit will affect other qubits on the chip, that is, there is magnetic flux crosstalk b...

AI Technical Summary

Problems solved by technology

[0003] However, for qubit chips integrated with frequency-tunable qubits, the magnetic flux applied to a certain qubit will affect other qubits on the chip, that is, there is magnetic flux crosstalk between qubits

[0004] In traditional technology, the magnetic flux crosstalk between every two qubits on the chip is generally measured pair by pair. For a chip with N qubits, the required measurement time is N 2 , and then for a chip with a large number of qubits to calibrate the magnetic flux crosstalk, there are problems of long calibration time and low efficiency

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