Device-independent secret-key-rate analysis for quantum repeaters

Timo Holz, Hermann Kampermann, and Dagmar Bruß
Phys. Rev. A 97, 012337 – Published 31 January 2018

Abstract

The device-independent approach to quantum key distribution (QKD) aims to establish a secret key between two or more parties with untrusted devices, potentially under full control of a quantum adversary. The performance of a QKD protocol can be quantified by the secret key rate, which can be lower bounded via the violation of an appropriate Bell inequality in a setup with untrusted devices. We study secret key rates in the device-independent scenario for different quantum repeater setups and compare them to their device-dependent analogon. The quantum repeater setups under consideration are the original protocol by Briegel et al. [Phys. Rev. Lett. 81, 5932 (1998)] and the hybrid quantum repeater protocol by van Loock et al. [Phys. Rev. Lett. 96, 240501 (2006)]. For a given repeater scheme and a given QKD protocol, the secret key rate depends on a variety of parameters, such as the gate quality or the detector efficiency. We systematically analyze the impact of these parameters and suggest optimized strategies.

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  • Received 24 November 2017

DOI:https://doi.org/10.1103/PhysRevA.97.012337

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Timo Holz*, Hermann Kampermann, and Dagmar Bruß

  • Theoretical Physics III, Heinrich Heine University Duesseldorf, D-40225 Duesseldorf, Germany

  • *holzt@uni-duesseldorf.de

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Issue

Vol. 97, Iss. 1 — January 2018

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