Finite-resource teleportation stretching for continuous-variable systems.

Abstract:

:We show how adaptive protocols of quantum and private communication through bosonic Gaussian channels can be simplifed into much easier block versions that involve resource states with finite energy. This is achieved by combining an adaptive-to-block reduction technique devised earlier, based on teleportation stretching and relative entropy of entanglement, with a recent finite-resource simulation of Gaussian channels. In this way, we derive weak converse upper bounds for the secret-key capacity of phase-insensitive Gaussian channels which approximate the optimal limit for infinite energy. Our results apply to both point-to-point and repeater-assisted private communications.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Laurenza R,Braunstein SL,Pirandola S

doi

10.1038/s41598-018-33332-y

subject

Has Abstract

pub_date

2018-10-15 00:00:00

pages

15267

issue

1

issn

2045-2322

pii

10.1038/s41598-018-33332-y

journal_volume

8

pub_type

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