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Quantum bit frequency calibration method based on Ramsey interference experiment

A qubit and frequency calibration technology, applied in the field of quantum measurement and control, can solve the problems such as the inability to realize the qubit frequency verification requirements and the inability to meet the qubit frequency accuracy, and achieve the effect of ensuring the qubit frequency calibration value and reducing the experimental error.

Active Publication Date: 2019-03-01
HEFEI ORIGIN QUANTUM COMP TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The existing energy spectrum measurement experiment obtains the qubit frequency f 0 The error of 1MHz cannot meet the requirements of qubit frequency accuracy, and cannot meet the verification requirements of qubit frequency

Method used

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  • Quantum bit frequency calibration method based on Ramsey interference experiment
  • Quantum bit frequency calibration method based on Ramsey interference experiment

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Embodiment Construction

[0017] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0018] The Ramsey interference experiment refers to applying two π / 2 quantum logic gate operations to a qubit, the time interval between the two operations is τ, and at the same time applying a readout to the qubit after the second π / 2 quantum logic gate operation Pulse to obtain the excited state distribution P1(τ) of the qubit, and change the time interval τ to obtain P1(τ).

[0019] The result of a typical Ramsey interference experiment is that P1(τ) satisfies the mathematical model of exponential oscillation decay with time interval τ as follows:

[0020]

[0021] In the above formula, A and B are fitting coefficients, T 0 is the decoherence time of the qubit, f d is the carrier frequency of the microwave pulse signal corresponding to the π / 2 quantum logic gate operation, f 0 is the...

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Abstract

The present invention belongs to the technical field of quantum measurement and control, and especially relates to a quantum bit frequency calibration method based on a Ramsey interference experiment.The method comprises the steps of: performing N-times Ramsey interference experiment for quantum bits, recording f0(f<N>d) obtained according to a result of each Ramsey interference experiment, and performing liner fitting of coordinate points formed by N f<N>d and the corresponding f0(f<N>d) in an orthogonal plane coordinate system to obtain a fitting linear equation; and according to the fitting linear equation, obtaining a fd value. The quantum bit frequency calibration method can effectively ensure the precision of the finally obtained quantum bit frequency calibration value by means of the Ramsey interference experiment and the data fitting.

Description

technical field [0001] The invention belongs to the technical field of quantum measurement and control, in particular to a qubit frequency calibration method based on a Ramsey interference experiment. Background technique [0002] Quantum computing has the potential to far exceed the performance of classical computers in solving specific problems. In order to realize a quantum computer, it is necessary to obtain a quantum chip containing a sufficient number and sufficient quality of qubits, and to be able to operate and read quantum logic gates with extremely high fidelity on the qubits. However, the qubit frequency parameter of the qubit will fluctuate with the environment. If this fluctuation is ignored, the fidelity of the quantum logic gate operation will be reduced, and the reading efficiency will also be affected. Therefore, the parameters of the quantum chip, especially the qubit frequency parameters, need to be calibrated regularly to ensure the best long-term stabl...

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Application Information

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IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 孔伟成
Owner HEFEI ORIGIN QUANTUM COMP TECH CO LTD
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