Effects of gravity on passive-state continuous variable quantum key distribution

IF 3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Annals of Physics Pub Date : 2025-03-22 DOI:10.1016/j.aop.2025.170003

Yuying Zhang , Jiayan Fu , Jian Zhou , Yanyan Feng , Ronghua Shi , Jinjing Shi

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Abstract

Quantum key distribution (QKD) has evolved from fiber-optic channels to free-space communication, with satellite-based systems enabling long-distance quantum communication. In such systems, gravitational effects become a critical factor to consider. Previous studies have introduced a passive state preparation scheme using a thermal source within the Gaussian Modulated Coherent State Quantum Key Distribution (GMCS-QKD) protocol. This approach allows for higher detector noise tolerance on Alice’s side and eliminates the need for a single-mode light source, as an optical net difference detector can selectively measure the desired mode based on the local oscillator. While thermal sources improve noise resilience, the influence of gravity on the preparation and propagation of quantum states remains a significant challenge. This study explores the impact of gravitational effects on the passive state preparation protocol, emphasizing its crucial role in achieving robust and secure quantum communication in satellite-based systems.

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重力对被动态连续变量量子密钥分配的影响

量子密钥分发（QKD）已经从光纤信道发展到自由空间通信，基于卫星的系统实现了长距离量子通信。在这样的系统中，引力效应成为一个需要考虑的关键因素。以前的研究已经在高斯调制相干态量子密钥分配（GMCS-QKD）协议中引入了一种使用热源的被动状态制备方案。这种方法允许爱丽丝侧更高的检测器噪声容限，并且消除了对单模光源的需求，因为光学净差检测器可以基于本地振荡器选择性地测量所需的模式。虽然热源可以提高噪声的弹性，但重力对量子态的制备和传播的影响仍然是一个重大的挑战。本研究探讨了引力效应对被动状态制备协议的影响，强调了其在实现星基系统中鲁棒和安全量子通信中的关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Physics 物理-物理：综合

CiteScore

5.30

自引率

3.30%

发文量

211

审稿时长

47 days

期刊介绍： Annals of Physics presents original work in all areas of basic theoretic physics research. Ideas are developed and fully explored, and thorough treatment is given to first principles and ultimate applications. Annals of Physics emphasizes clarity and intelligibility in the articles it publishes, thus making them as accessible as possible. Readers familiar with recent developments in the field are provided with sufficient detail and background to follow the arguments and understand their significance. The Editors of the journal cover all fields of theoretical physics. Articles published in the journal are typically longer than 20 pages.