Abstract

A 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

中文翻译：

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真空波动下确定性安全量子通信

摘要

实际的量子系统不可避免地会受到外部环境的影响，这会产生噪声或退相干，并且在现实情况下会降低量子通信的效率。在本文中，我们提出了一种嘈杂的确定性安全量子通信（DSQC）方案。我们发现保真度与量子相干性密切相关，并且随着去相干时间下降到稳定值。较小的两个原子距离可以提高保真度和相干性，并且反射边界可以有效地抑制保真度和相干性在真空波动的影响下退化。我们的研究将有助于提高开放量子系统的通信效率。

图形概要