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Manipulating entanglement against dissipation by pre- and post-measurements with initial system-environment correlations

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Abstract

We consider that two qubits interact with a common structured reservoir and initially there are correlations between the qubit system and the reservoir. By performing local measurements before and after the two qubits undergo decoherence, not only more entanglement can be produced between them at the beginning, but also the produced entanglement can decay more slowly. We focus on investigating the effects of different initial system-environment correlations on the entanglement of the two qubits, and in each case, we obtain the optimal pre- and post-measurement strength that give the maximum amount of entanglement of the two qubits. We also find that the initial quantum correlations would induce much more entanglement than the initial classical correlations, and the induced entanglement can preserve longer in the initial quantum correlation case. The enhancement of the entanglement depends on the evolution time, the decay rate and the initial state.

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Authors and Affiliations

  1. School of Physics, Beijing Institute of Technology, Beijing, 100081, P.R. China

    Yan Yan, Jian Zou, Chao-Quan Wang, Bao-Ming Xu & Bin Shao

  2. School of Information and Electronic Engineering, Shandong Institute of Business and Technology, Yantai, 264000, P.R. China

    Hai Li

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  1. Yan Yan
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  2. Jian Zou
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  3. Chao-Quan Wang
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  4. Bao-Ming Xu
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  5. Hai Li
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  6. Bin Shao
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Correspondence to Jian Zou.

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Yan, Y., Zou, J., Wang, CQ. et al. Manipulating entanglement against dissipation by pre- and post-measurements with initial system-environment correlations. Eur. Phys. J. D 69, 154 (2015). https://doi.org/10.1140/epjd/e2015-50757-8

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