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

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

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Keywords

  • Decoherence
  • Finite temperature
  • Environment-assisted measurement