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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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.