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Effect of partial-collapse measurement on quantum entanglement in noninertial frames

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Abstract

An efficient method is proposed to improve two-qubit entanglement under the action of noise channel in noninertial frames by using partial-collapse measurement. We focus on the influence of partial-collapse measurement on entanglement for different noise channels in noninertial frames. It is shown that entanglement can be enhanced greatly for phase-flip, phase-damping, depolarizing and amplitude-damping channels. We obtain the optimal concurrence for the four noise channels, respectively. Moreover, ’entanglement sudden death’ can be avoided for amplitude-damping environment. Our work provides a novel method to improve quantum entanglement under both noise environment and Unruh effect and exhibits the ability of partial-collapse measurement as an important technique in relativistic quantum information.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No.11374096), 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, Wei Wen & Man-Sheng Rong

  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. Wei Wen
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  3. Man-Sheng Rong
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  4. Mao-Fa Fang
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Correspondence to Xiang-Ping Liao.

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Liao, XP., Wen, W., Rong, MS. et al. Effect of partial-collapse measurement on quantum entanglement in noninertial frames. Quantum Inf Process 19, 106 (2020). https://doi.org/10.1007/s11128-020-2600-3

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