Heralded amplification of path entangled quantum states

Journal article (2017)

Authors

F. Monteiro Université de Genève
E. Verbanis Université de Genève
V. Caprara Vivoli QID/Wehner Group - QuTech Advanced Research Centre
A. Martin Université de Genève
N Gisin Université de Genève
H. Zbinden Université de Genève
R. T. Thew Université de Genève
Research Group
QID/Wehner Group (QuTech Advanced Research Centre) (TU Delft)
More Info
expand_more

Published Date

01-06-2017

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

QuTech Advanced Research Centre

Department

Quantum Internet Division

Research Group

QID/Wehner Group

Abstract

Device-independent quantum key distribution (DI-QKD) represents one of the most fascinating challenges in quantum communication, exploiting concepts of fundamental physics, namely Bell tests of nonlocality, to ensure the security of a communication link. This requires the loophole-free violation of a Bell inequality, which is intrinsically difficult due to losses in fibre optic transmission channels. Heralded photon amplification (HPA) is a teleportation-based protocol that has been proposed as a means to overcome transmission loss for DI-QKD. Here we demonstrate HPA for path entangled states and characterise the entanglement before and after loss by exploiting a recently developed displacement-based detection scheme. We demonstrate that by exploiting HPA we are able to reliably maintain high fidelity entangled states over loss-equivalent distances of more than 50 km.