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Detector-device-independent quantum key distribution: Security analysis and fast implementation

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Published in Journal of Applied Physics. 2016, vol. 120, no. 6, p. 063101
Abstract One of the most pressing issues in quantum key distribution (QKD) is the problem of detector side-channel attacks. To overcome this problem, researchers proposed an elegant “time-reversal” QKD protocol called measurement-device-independent QKD (MDI-QKD), which is based on time-reversed entanglement swapping. However, MDI-QKD is more challenging to implement than standard point-to-point QKD. Recently, an intermediary QKD protocol called detector-device-independent QKD (DDI-QKD) has been proposed to overcome the drawbacks of MDI-QKD, with the hope that it would eventually lead to a more efficient detector side-channel-free QKD system. Here, we analyze the security of DDI-QKD and elucidate its security assumptions. We find that DDI-QKD is not equivalent to MDI-QKD, but its security can be demonstrated with reasonable assumptions. On the more practical side, we consider the feasibility of DDI-QKD and present a fast experimental demonstration (clocked at 625 MHz), capable of secret key exchange up to more than 90 km.
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Research group Groupe Zbinden
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BOARON, Alberto et al. Detector-device-independent quantum key distribution: Security analysis and fast implementation. In: Journal of Applied Physics, 2016, vol. 120, n° 6, p. 063101. https://archive-ouverte.unige.ch/unige:86006

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Deposited on : 2016-08-15

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