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Restoring Quantum States from Decoherence of Finite Temperature Using Environment-Assisted Measurement

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Abstract

We examine the validity of the environment-assisted measurement (EAM) in the restoration of quantum state and quantum entanglement in the non-zero temperature environment. Special attention is paid to the dependence of quantum fidelity and entanglement on the temperature T. In particular, by solving the master equation, we get the exact analytical or numerical simulations expressions of the optimal final restoration, showing explicitly that combining the EAM and quantum measurement reversal (QMR) operations does indeed help in recovering single-qubit quantum state and arbitrarily two-qubit quantum entanglement from finite temperature decoherence.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (Grant No. 61605019), the Research Foundation of Education Bureau of Hunan Province, China (Grant No. 18B601), the Applied Characteristic Disciplines in Hunan Province-Electronic Science and Technology of China, and Hunan-Provincial Key Laboratory of Photoelectric Information Integration and Optical Manufacturing Technology. Qiong Wang is supported by the Program of Hehua Excellent Young Talents, Changsha Normal University.

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Authors and Affiliations

  1. College of Mathematics and Physics Science, Hunan University of Arts and Science, Changde, 415000, China

    Qiong Wang & Zhi He

  2. College of Elementary Education, Changsha Normal University, Changsha, Hunan, 410100, China

    Qiong Wang

  3. College of Mathematics and Science, Hunan First Normal University, Changsha, 410205, China

    Lan Xu

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  1. Qiong Wang
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  2. Lan Xu
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  3. Zhi He
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Correspondence to Qiong Wang.

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Wang, Q., Xu, L. & He, Z. Restoring Quantum States from Decoherence of Finite Temperature Using Environment-Assisted Measurement. Int J Theor Phys 59, 2471–2479 (2020). https://doi.org/10.1007/s10773-020-04514-0

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  • DOI: https://doi.org/10.1007/s10773-020-04514-0

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