Security flaws from time-varying active encoding in high-speed measurement-device-independent quantum key distribution

• URL: http://arxiv.org/abs/2404.14216v1
• Date: Mon, 22 Apr 2024 14:31:40 GMT
• Title: Security flaws from time-varying active encoding in high-speed measurement-device-independent quantum key distribution
• Authors: Amita Gnanapandithan, Li Qian, Hoi-Kwong Lo,
• Abstract summary: Quantum key distribution (QKD) can transmit secret keys with, in principle, information-theoretic security. bandwidth limitations in practical equipment threaten the security of high-speed (GHz) QKD systems. We propose and characterize a new side channel which arises when using active encoding.
• Score: 0.1749935196721634
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum key distribution (QKD) can transmit secret keys with, in principle, information-theoretic security. However, bandwidth limitations in practical equipment threaten the security of high-speed (GHz) QKD systems. We propose and characterize a new side channel which arises when using active encoding. As an illustrative example, we focus on electro-optic phase modulation for polarization encoding at 1 GHz. We show that this side channel may reduce the maximum secure transmission distance by over 50% in a decoy state measurement-device-independent QKD protocol.

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