Experimental Side-Channel-Secure Quantum Key Distribution over 200 km

• URL: http://arxiv.org/abs/2505.03524v1
• Date: Tue, 06 May 2025 13:36:24 GMT
• Title: Experimental Side-Channel-Secure Quantum Key Distribution over 200 km
• Authors: Yang Zhou, Jing-Yang Liu, Chun-Hui Zhang, Hua-Jian Ding, Xing-Yu Zhou, Jian Li, Qin Wang,
• Abstract summary: Quantum key distribution enables two remote parties to share encryption keys with information-theoretic security based on physical laws.<n>Side-channel-secure quantum key distribution (SCS-QKD) has attracted considerable attention due to its immunity to both source and detector side-channel attacks.<n>We experimentally implement the practical SCS-QKD protocol using an imperfect whole-space source.<n>This allows us to extend the transmission distance to 200 km using fiber spools, achieving a secure key rate of 1.29E-7 bits per pulse while accounting for finite-key effects.
• Score: 18.189225381709278
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution enables two remote parties to share encryption keys with information-theoretic security based on physical laws. Side-channel-secure quantum key distribution (SCS-QKD) has attracted considerable attention due to its immunity to both source and detector side-channel attacks. Recently, a demonstration of SCS-QKD over 50 km has been realized. However, practical implementation of this protocol faces significant challenges, including the presence of an imperfect vacuum state and coherent attacks involving a limited number of pulses. Here, based on the theoretical work of Jiang et al. [Phys. Rev. Research 6, 013266 (2024)], we experimentally implemented the practical SCS-QKD protocol using an imperfect whole-space source. This allows us to extend the transmission distance to 200 km using fiber spools, achieving a secure key rate of 1.29E-7 bits per pulse while accounting for finite-key effects. These results establish a new distance record for SCS-QKD and highlight its potential for practical applications. We anticipate that this work will advance the practical implementation and security of quantum key distribution.

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