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Superconducting Qubits

Realisation of adiabatic and diabatic CZ gates in superconducting qubits coupled with a tunable coupler

arXiv

Authors: Huikai Xu, Weiyang Liu, Zhiyuan Li, Jiaxiu Han, Jingning Zhang, Kehuan Linghu, Yongchao Li, Mo Chen, Zhen Yang, Junhua Wang, Teng Ma, Guangming Xue, Yirong Jin, Haifeng Yu

Year

2020

Paper ID

19627

Status

Preprint

Abstract Read

~2 min

Abstract Words

109

Citations

N/A

Abstract

High fidelity two-qubit gates are fundamental for scaling up the superconducting number. We use two qubits coupled via a frequency-tunable coupler which can adjust the coupling strength, and demonstrate the CZ gate using two different schemes, adiabatic and diabatic methods. The Clifford based Randomized Benchmarking (RB) method is used to assess and optimize the CZ gate fidelity. The fidelity of adiabatic and diabatic CZ gates are 99.53(8)% and 98.72(2)%, respectively. We also analyze the errors induced by the decoherence. Comparing to 30 ns duration time of adiabatic CZ gate, the duration time of diabatic CZ gate is 19 ns, revealing lower incoherence error rate r'_{rm{incoherent, int}} = 0.0197(5) than r_{rm{incoherent, int}} = 0.0223(3).

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High fidelity two-qubit gates are fundamental for scaling up the superconducting number.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2010.14053 [2] arXiv https://arxiv.org/abs/2010.14053 [3] Publisher https://arxiv.org/abs/2010.14053

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