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Asymmetric twin-field quantum key distribution | | Federico Grasselli
; Alvaro Navarrete
; Marcos Curty
; | | Date: |
11 Jul 2019 | | Abstract: | 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. Analytical
bounds on the relevant yields have been recently derived assuming that both
parties use the same set of decoy intensities, thus providing sub-optimal key
rates in asymmetric-loss scenarios. Here we derive new analytical bounds when
the parties use either three or four independent decoy intensity settings each.
With the new bounds we optimize the protocol’s performance in asymmetric-loss
scenarios and show that the protocol is robust against uncorrelated intensity
fluctuations affecting the parties’ lasers. | | Source: | arXiv, 1907.5256 | | Services: | Forum | Review | PDF | Favorites | |
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