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- W4313535086 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 a recently developed numerical proof technique [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." @default.
- W4313535086 created "2023-01-06" @default.
- W4313535086 creator A5008633046 @default.
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- W4313535086 date "2022-12-20" @default.
- W4313535086 modified "2023-10-18" @default.
- W4313535086 title "Measurement-device-independent quantum key distribution with passive time-dependent source side channels" @default.
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- W4313535086 doi "https://doi.org/10.1103/physreva.106.062618" @default.
- W4313535086 hasPublicationYear "2022" @default.
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