Twin-field quantum key distribution with fully discrete phase randomization
arXiv:2008.03222 · doi:10.1103/PhysRevApplied.15.014016
Abstract
Twin-field (TF) quantum key distribution (QKD) can overcome fundamental secret-key-rate bounds on point-to-point QKD links, allowing us to reach longer distances than ever before. Since its introduction, several TF-QKD variants have been proposed, and some of them have already been implemented experimentally. Most of them assume that the users can emit weak coherent pulses with a continuous random phase. In practice, this assumption is often not satisfied, which could open up security loopholes in their implementations. To close this loophole, we propose and prove the security of a TF-QKD variant that relies exclusively on discrete phase randomisation. Remarkably, our results show that it can also provide higher secret-key rates than counterpart protocols that rely on continuous phase randomisation.
References in corpus (6)
- Sending-or-Not-Sending with Independent Lasers: Secure Twin-Field Quantum Key Distribution Over 509 km
- Post-selection technique for quantum channels with applications to quantum cryptography
- Experimental quantum key distribution beyond the repeaterless secret key capacity
- Beating the fundamental rate-distance limit in a proof-of-principle quantum key distribution system
- Discrete-phase-randomized coherent state source and its application in quantum key distribution
- Twin-field quantum key distribution with discrete-phase-randomized sources
Cited by in corpus (6)
- Security of quantum key distribution with imperfect phase randomisation
- Reference-frame-independent design of phase-matching quantum key distribution
- Secret key rate bounds for quantum key distribution with non-uniform phase randomization
- Improving the performance of twin-field quantum key distribution with advantage distillation technology
- Finite-key analysis for quantum key distribution with discrete phase randomization
- Characterising higher-order phase correlations in gain-switched laser sources with application to quantum key distribution