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Effcient and high-fidelity two-qubit gates are crucial to achieving fault-tolerant quantum computing and are one of the key research topics in the field of quantum computing. The fidelity of quantum gates is affected by many factors, such as quantum chip parameters and control waveforms. In theory, the chip paramters and waveforms are precisely designed. However, in practice the actual chip parameters and waveforms may deviate from the theoretical values. It is necessary to systematically study the impact of chip parameters, control waveforms and other factors on the fidelity of two-qubit gates, and identify the magnitude and direction of the impact of each factor on the fidelity of quantum gates. Here, we systematically studies the effects of chip parameters, control waveforms, coupler start frequency, qubit frequency, etc., on the fidelity of CZ gates. On this basis, the response of gate fidelity to control parameters deviation is further studied. At the chip design level, quantum chips based on CBQ parameters can achieve higher-fidelity CZ gates in shorter gate operation time. In terms of controlling waveforms, threelevel Fourier series wave is superior to the square wave and rounded trapezoidal wave in terms of gate error rate and gate operation time, and can better meet the requirements for effcient implementation of high-fidelity quantum gates. Factors such as the coupler starting frequency and qubit frequency have relatively little effect on the fidelity of the CZ gate. In a wide frequency range, high-fidelity CZ gates can always be achieved by optimizing the control waveform parameters. It is important to point out that slight deviations in control parameters will lead to a significant increase in the gate error. This study is of great significance for clarifying the impact of various factors on the fidelity of the CZ gate. It can provide theoretical and technical support for the design of superconducting quantum chips and the realization of high-fidelity CZ gate, and promote the engineering development of quantum computing.
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Keywords:
- Quantum Computing /
- Quantum Gates /
- Quantum Control /
- Fidelity
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