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Average fidelity estimation of twirled noisy quantum channel using unitary 2t-design |
Linxi Zhang(张林曦)1,2, Changhua Zhu(朱畅华)1, Changxing Pei(裴昌幸)1 |
1 State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China;
2 Science and Technology on Communication Networks Laboratory, Shijiazhuang 050081, China |
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Abstract We propose a method to estimate the average fidelity using the unitary 2t-design of a twirled noisy channel, which is suitable for large-scale quantum circuits. Compared with the unitary 2-design in randomized benchmarking, the unitary 2t-design for the twirling of noisy channels is more flexible in construction and can provide more information. In addition, we prove that the proposed method provides an efficient and reliable estimation of the average fidelity in benchmarking multistage quantum gates and estimating the weakly gate- and time-dependent noise. For time-dependent noise, we provide a scheme of moment superoperator to analyze the noise in different experiments. In particular, we give a lower bound on the average fidelity of a channel with imperfect implementation of benchmarking and state preparation and measurement errors (SPAM).
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Received: 09 July 2018
Revised: 04 November 2018
Accepted manuscript online:
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PACS:
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03.65.Wj
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(State reconstruction, quantum tomography)
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03.67.Lx
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(Quantum computation architectures and implementations)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61372076 and 61701375), the 111 Project, China (Grant No. B08038), the Key Research and Development Plan of Shannxi Province, China (Grant No. BBD24017290001), and the Foundation of Science and Technology on Communication Networks Laboratory, China (Grant No. KX172600031). |
Corresponding Authors:
Linxi Zhang
E-mail: zhanglinxi@stu.xidian.edu.cn
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Cite this article:
Linxi Zhang(张林曦), Changhua Zhu(朱畅华), Changxing Pei(裴昌幸) Average fidelity estimation of twirled noisy quantum channel using unitary 2t-design 2019 Chin. Phys. B 28 010304
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