Loss tolerant device-independent quantum key distribution: a proof of principle

Abstract

We here present the rate analysis and a proof of principle demonstration of a device-independent quantum key distribution protocol requiring the lowest detection efficiency necessary to achieve a secure key compared to deviceindependent protocols known so far. The protocol is based on a non-maximally entangled state and its experimental demonstration has been performed by twophoton bipartite entangled states. The improvement with respect to protocols involving maximally entangled states has been estimated.

The heralded amplification for the single-photon multi-mode W state of the time-bin qubit

“…Quantum entanglement is an importance source in quantum communications [1][2][3][4][5][6][7][8]. For example, in the fields of quantum teleportation [1,2], quantum key distribution (QKD) [3][4][5], quantum state sharing (QSS) [6], quantum secure direct communication (QSDC) [7,8], the parties all resort to the entanglement to set up the quantum channel. Entanglement is also essential in quantum computations [9][10][11].…”

Reply to “Comment on ‘Device-independent entanglement-based Bennett 1992 protocol’ ”

“…A proof-of-principle experiment of the protocol, called Lucamarini-Vallone-Gianani-Mataloni-Di Giuseppe (LVGMD), was in fact provided in Ref. [6].…”

“…In our view, the Comment actually targets two works, i.e., Refs. [1,6] with the following two points:…”

“…(2) The experiment performed in Ref. [6] is not loophole free, so it does not represent a DI implementation of the protocol in Ref. [1].…”

“…In the case of Ref. [6], a proof-of-principle experiment as written in the title, the fair sampling assumption was enforced as in all the Bell inequality tests performed so far with the exception of the already cited works [16][17][18].…”