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Effects of partial-collapse measurement on the parameter-estimation precision of noisy quantum channels

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Abstract

An efficient method is proposed to enhance the parameter-estimation precision for noisy quantum channels based on measurement reversal from partial-collapse measurement. It is shown that the quantum Fisher information can be distinctly improved for amplitude-damping channel, phase-damping channel and depolarizing channel with partial-collapse measurement. This also means that choosing the appropriate measurement strengths can lead to higher precision of estimation on noisy quantum channels.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11374096 and 11604094), the Natural Science Foundation of Hunan Province of China (Grant No. 2016JJ2044) and the Major Program for the Research Foundation of Education Bureau of Hunan Province of China (Grant No. 16A057).

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Authors and Affiliations

  1. College of Science, Hunan University of Technology, Zhuzhou, 412008, Hunan, China

    Xiang-Ping Liao & Xin Zhou

  2. College of Physics and Information Science, Hunan Normal University, Changsha, 410081, Hunan, China

    Mao-Fa Fang

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  1. Xiang-Ping Liao
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  2. Mao-Fa Fang
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  3. Xin Zhou
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Correspondence to Xiang-Ping Liao.

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Liao, XP., Fang, MF. & Zhou, X. Effects of partial-collapse measurement on the parameter-estimation precision of noisy quantum channels. Quantum Inf Process 16, 241 (2017). https://doi.org/10.1007/s11128-017-1696-6

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  • DOI: https://doi.org/10.1007/s11128-017-1696-6

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