Multilevel dynamical decoupling for a coupled superconducting two-qubit system

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 ${X}_{\ensuremath{\pi}}$ 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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Publication Details

Journal
Physical review. A/Physical review, A
Published
2025-08-29
DOI
https://doi.org/10.1103/6wd3-wc5s
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
0.00

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article

Multilevel dynamical decoupling for a coupled superconducting two-qubit system

Shiyao Yang, Kaixuan Zhang, Ziru Hou, Tianshi Zhou et al.
Physical review. A/Physical review, A
Quantum Information and Cryptography
article

Multilevel dynamical decoupling for a coupled superconducting two-qubit system

Shiyao Yang, Kaixuan Zhang, Ziru Hou, Tianshi Zhou, Guozhu Sun, Lingxiao Jing, Jiyuan Zhu, Huashi Ma, Wenqu Xu, Qi Zuo, Peiheng Wu, Junzhou Zhang, Mingyuan Yu, Junliang Jiang, Tingting Guo, Binglin Li, Jinpeng Li, Zishuo Li, Jiazheng Pan, Haifeng Song, Chunhai Cao, Sining Zhou, Yongyang Yu
article en

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 ${X}_{\ensuremath{\pi}}$ 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.

Physical review. A/Physical review, AVol. 112(2)
Hefei University (CN), Purple Mountain Laboratories (CN), Nanjing University (CN)
National Natural Science Foundation of China, Nanjing University
Openalex Percentile: Top 88%
Quantum Information and Cryptography
DOISourceOpenAlex
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