Related papers: Breaking the Rate-Loss Bound of Quantum Key Distribution with Asynchronous Two-Photon Interference

Breaking the Rate-Loss Bound of Quantum Key Distribution with Asynchronous Two-Photon Interference

URL: http://arxiv.org/abs/2112.11635v3
Date: Tue, 26 Apr 2022 08:17:40 GMT
Title: Breaking the Rate-Loss Bound of Quantum Key Distribution with Asynchronous Two-Photon Interference
Authors: Yuan-Mei Xie, Yu-Shuo Lu, Chen-Xun Weng, Xiao-Yu Cao, Zhao-Ying Jia, Yu Bao, Yang Wang, Yao Fu, Hua-Lei Yin, Zeng-Bing Chen
Abstract summary: A new quantum key distribution protocol can surpass the secret key capacity even without phase tracking and phase locking. Our work provides a promising candidate for practical scalable quantum communication networks.
Score: 16.81040156666027
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Twin-field quantum key distribution can overcome the secret key capacity of repeaterless quantum key distribution via single-photon interference. However, to compensate for the channel fluctuations and lock the laser fluctuations, the techniques of phase tracking and phase locking are indispensable in experiment, which drastically increase experimental complexity and hinder free-space realization. Inspired by the duality in entanglement, we herein present an asynchronous measurement-device-independent quantum key distribution protocol that can surpass the secret key capacity even without phase tracking and phase locking. Leveraging the concept of time multiplexing, asynchronous two-photon Bell-state measurement is realized by postmatching two interference detection events. For a 1 GHz system, the new protocol reaches a transmission distance of 450 km without phase tracking. After further removing phase locking, our protocol is still capable of breaking the capacity at 270 km. Intriguingly, when using the same experimental techniques, our protocol has a higher key rate than the phase-matching-type twin-field protocol. In the presence of imperfect intensity modulation, it also has a significant advantage in terms of the transmission distance over the sending-or-not-sending type twin-field protocol. With high key rates and accessible technology, our work provides a promising candidate for practical scalable quantum communication networks.

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