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Protecting nonlocality of multipartite states by feed-forward control

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Abstract

Nonlocality is a useful resource in quantum communication and quantum information processing. In practical quantum communication, multipartite entangled states must be distributed between different users in different places through a channel. However, the channel is usually inevitably disturbed by the environment in quantum state distribution processing and then the nonlocality of states will be weakened and even lost. In this paper, we use a feed-forward control scheme to protect the nonlocality of the Bell and GHZ states against dissipation. We find that this protection scheme is very effective, specifically, for the Bell state, we can increase the noise threshold from 0.5 to 0.98, and for GHZ state from 0.29 to 0.96. And we also find that entanglement is relatively easier to be protected than nonlocality. For our scheme, protecting entanglement is equivalent to protecting the state in the case of Bell state, while protecting nonlocality is not.

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Authors and Affiliations

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

    Xiao-Gang Li, Jian Zou & Bin Shao

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  1. Xiao-Gang Li
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  2. Jian Zou
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  3. Bin Shao
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Corresponding author

Correspondence to Jian Zou.

Additional information

This work was supported by the National Natural Science Foundation of China (Grants Nos. 11775019 and 11375025).

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Li, XG., Zou, J. & Shao, B. Protecting nonlocality of multipartite states by feed-forward control. Quantum Inf Process 17, 123 (2018). https://doi.org/10.1007/s11128-018-1888-8

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