Discrete‐Modulated Continuous‐Variable Quantum Key Distribution in Satellite‐to‐Ground Communication

Author:

Li Shi‐Gen12,Li Chen‐Long12,Liu Wen‐Bo12,Yin Hua‐Lei12ORCID,Chen Zeng‐Bing1

Affiliation:

1. National Laboratory of Solid State Microstructures and School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

2. Department of Physics and Beijing Key Laboratory of Opto‐electronic Functional Materials and Micro‐nano Devices, Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Renmin University of China Beijing 100872 China

Abstract

AbstractSatellite‐to‐ground quantum communication constitutes the cornerstone of the global quantum network, heralding the advent of the future of quantum information. Continuous‐variable quantum key distribution is a strong candidate for the space‐ground quantum communication due to its simplicity, stability, and ease of implementation, especially for the robustness of space background light noise. Recently, the discrete‐modulated continuous‐variable protocol has garnered increased attention, owing to its lower implementation requirements, acceptable security key rate, and pronounced compatibility with extant infrastructures. Here, key rates are derived for discrete‐modulated continuous‐variable quantum key distribution protocols in free‐space channel environments across various conditions through numerical simulation, revealing the viability of its application in satellite‐to‐ground communication.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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