Simple security proof of twin-field type quantum key distribution protocol
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/4010
EDITED VERSION: http://www.nature.com/articles/s41534-019-0175-6
UNESCO SUBJECT: 3325 Tecnología de las Telecomunicaciones ; 2212.11 Fotones ; 3311.04 Dispositivos Electroópticos
DOCUMENT TYPE: article
Twin-field (TF) quantum key distribution (QKD) was conjectured to beat the private capacity of a point-to-point QKD link by using single-photon interference in a central measuring station. This remarkable conjecture has recently triggered an intense research activity to prove its security. Here, we introduce a TF-type QKD protocol which is conceptually simpler than the original proposal. It relies on the pre-selection of a global phase, instead of the post-selection of a global phase, which significantly simplifies its security analysis and is arguably less demanding experimentally. We demonstrate that the secure key rate of our protocol has a square-root improvement over the point-to-point private capacity, as conjectured by the original TF QKD.
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