Multilevel dynamical decoupling for a coupled superconducting two-qubit system
Wenqu Xu, Tianshi Zhou, Kaixuan Zhang, Zishuo Li, Tingting Guo, Quan Zuo, Mingyuan Yu, Junliang Jiang, Jiazheng Pan, Jinpeng Li, Lingxiao Jing, Huashi Ma, Shunhong Zhou, Binglin Li, Shiyao Yang, Yongyang Yu, Junzhou Zhang, Jiyuan Zhu, Ziru Hou, Haifeng Song, Chunhai Cao, Guozhu Sun, Peiheng Wu
DOI 10.1103/6wd3-wc5s · Physical Review A
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Abstract
Recent advances have significantly enhanced the coherence times of superconducting qubits. However, high-fidelity storage of multiqubit quantum states in large-scale circuits is still limited by factors such as the flux noise and crosstalk. We propose an X-iSwap decoupling sequence combining single-qubit Xπ gates and two-qubit iSwap gates to effectively mitigate dephasing from the low-frequency flux noise and eliminate crosstalk between qubits. Numerical simulations of noisy random evolution show excellent agreement with the theoretical models. In quantum memory applications, our method substantially extends the decay time of two-qubit fidelity and eliminates fidelity oscillations caused by the ZZ crosstalk. Compared to the traditional decoupling methods based on single-qubit gates, the X-iSwap sequence exhibits superior robustness against small system errors, which holds promise for widespread application in two-qubit systems and large-scale quantum processors for tasks such as long-term quantum memory and entanglement protection.
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