Asymmetric twin-field quantum key distribution

Understand

Twin-Field (TF) quantum key distribution (QKD) is a major candidate to be the new benchmark for far-distance QKD implementations, since its secret key rate can overcome the repeaterless bound by means of a simple interferometric measurement.

• Many variants of the original protocol have been recently proven to be secure.
• Here, we focus on the TF-QKD type protocol proposed by Curty et al [preprint arXiv:1807.07667], which can provide a high secret key rate and whose practical feasibility has been demonstrated in various recent experiments.
• The security of this protocol relies on the estimation of certain detection probabilities (yields) through the decoy-state technique.