Detection of temporal fluctuation in superconducting qubits for quantum error mitigation

被引：4
|
作者：
Hirasaki, Yuta [1 ]
Daimon, Shunsuke [1 ,2 ]
Itoko, Toshinari [3 ]
Kanazawa, Naoki [3 ]
Saitoh, Eiji [1 ,4 ,5 ,6 ]
机构：
[1] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[2] Natl Inst Quantum Sci & Technol QST, Quantum Mat & Applicat Res Ctr, Tokyo 1528550, Japan
[3] IBM Res Tokyo, IBM Quantum, 19-21 Nihonbashi Hakozaki Cho,Chuo Ku, Tokyo 1038510, Japan
[4] Univ Tokyo, Inst AI & Beyond, Tokyo 1138656, Japan
[5] Tohoku Univ, WPI Adv Inst Mat Res, Sendai 9808577, Japan
[6] Tohoku Univ, Inst Mat Res, Sendai 9808577, Japan
来源：
APPLIED PHYSICS LETTERS | 2023年 / 123卷 / 18期
关键词：
NOISE;
D O I：
10.1063/5.0166739
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated instability of a superconducting quantum computer by continuously monitoring the qubit output. We found that qubits exhibit a step-like change in the error rates. This change is repeatedly observed, and each step persists for several minutes. By analyzing the correlation between the increased errors and anomalous variance of the output, we demonstrate quantum error mitigation based on post-selection. We have reduced the errors from 5.4% to 1.6% in a Bell state measurement and from 17.5% to 12.0% in a quantum volume circuit. Numerical analysis on the proposed method was also conducted.
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收藏
页数：5
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