Measurement device-independent quantum key distribution with passive, time-dependent source side-channels

• URL: http://arxiv.org/abs/2108.08698v1
• Date: Thu, 19 Aug 2021 14:08:22 GMT
• Title: Measurement device-independent quantum key distribution with passive, time-dependent source side-channels
• Authors: J. Eli Bourassa, Amita Gnanapandithan, Li Qian, Hoi-Kwong Lo
• Abstract summary: We identify a time-dependent side-channel in a common polarization-based QKD source that employs a mirror for phase stabilization. We develop strategies to quantify the sensitivity of the secret key rate to the quantum optical model for the side-channel, and to mitigate the information leakage.
• Score: 0.39373541926236766
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: While measurement-device-independent (MDI) quantum key distribution (QKD) allows two trusted parties to establish a shared secret key from a distance without needing to trust a central detection node, their quantum sources must be well-characterized, with side-channels at the source posing the greatest loophole to the protocol's security. In this paper, we identify a time-dependent side-channel in a common polarization-based QKD source that employs a Faraday mirror for phase stabilization. We apply the recently developed numerical proof technique from [Phys. Rev. A 99, 062332 (2019)] to quantify the sensitivity of the secret key rate to the quantum optical model for the side-channel, and to develop strategies to mitigate the information leakage. In particular, we find that the MDI three-state and BB84 protocols, while yielding the same key rate under ideal conditions, have diverging results in the presence of a side-channel, with BB84 proving more advantageous. While we consider only a representative case example, we expect the strategies developed and key rate analysis method to be broadly applicable to other leaky sources.

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