Deterministic secure quantum communication under vacuum fluctuation

Deterministic secure quantum communication under vacuum fluctuation
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真空涨落下确定性安全量子通信

DOI:
10.1140/epjd/e2020-10351-9
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发表时间:
2020-09
影响因子:
1.8
通讯作者:
Zhimin He
Zhimin He
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zhiming Huang;Zhimin He

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摘要真实的量子系统不可避免地会受到外界环境的影响,产生噪声或退相干,从而降低量子通信的效率。本文提出了一种带噪声的确定性安全量子通信方案。我们发现保真度与量子相干性密切相关,并随着退相干时间的增加而趋于稳定值。小的原子间距可以提高保真度和相干性,反射边界可以有效地抑制真空涨落对保真度和相干性的影响。我们的研究将有助于提高开放量子系统的通信效率。图形摘要
AbstractA real quantum system is unavoidably affected by external environment, which would produce noise or decoherence, and reduce the efficiency of quantum communication in realistic circumstance. In this paper, we present a noisy deterministic secure quantum communication (DSQC) scheme. We find that fidelity has close relation with quantum coherence and declines to a stable value with decoherent time. Small two-atom distance can improve the fidelity and coherence, and a reflecting boundary can effectively inhibit fidelity and coherence from degradation under the effect of vacuum fluctuation. Our study would be helpful to promote the communication efficiency of open quantum system.Graphical abstract
DOI: 10.1103/physrevlett.113.140401
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