Quantifying nonlocality as a resource for device-independent quantum key distribution - Sorbonne Université
Journal Articles Physical Review A Year : 2020

Quantifying nonlocality as a resource for device-independent quantum key distribution

Abstract

We introduce, for any bipartite Bell scenario, a measure that quantifies both the amount of nonlocality and the efficiency in device-independent quantum key distribution of a set of measurement outcomes probabilities. It is a proper measure of nonlocality as it vanishes when this set is Bell local and does not increase under the allowed transformations of the nonlocality resource theory. This device-independent key rate R is defined by optimizing over a class of protocols, to generate the raw keys, in which each legitimate party does not use just one preselected measurement but randomly chooses at each round one among all the measurements at its disposal. A common and secret key can certainly be established when R is positive but not when it is zero. For any continuous proper measure of nonlocality N , R is tightly lower bounded by a nondecreasing function of N that vanishes when N does. There can thus be a threshold value for the amount of nonlocality as quantified by N above which a secret key is surely achievable. A readily computable measure with such a threshold exists for two two-outcome measurements per legitimate party.
Fichier principal
Vignette du fichier
Camalet - 2020 - Quantifying nonlocality as a resource for device-i.pdf (376.72 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-03024864 , version 1 (26-11-2020)

Identifiers

Cite

S. Camalet. Quantifying nonlocality as a resource for device-independent quantum key distribution. Physical Review A, 2020, 102 (1), ⟨10.1103/PhysRevA.102.012617⟩. ⟨hal-03024864⟩
37 View
28 Download

Altmetric

Share

More