CUED Publications database

Quantum key distribution without detector vulnerabilities using optically seeded lasers

Comandar, LC and Lucamarini, M and Fröhlich, B and Dynes, JF and Sharpe, AW and Tam, SWB and Yuan, ZL and Penty, RV and Shields, AJ (2016) Quantum key distribution without detector vulnerabilities using optically seeded lasers. Nature Photonics, 10. pp. 312-315. ISSN 1749-4885

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Abstract

© 2016 Macmillan Publishers Limited. All rights reserved. Security in quantum cryptography is continuously challenged by inventive attacks targeting the real components of a cryptographic set-up, and duly restored by new countermeasures to foil them. Owing to their high sensitivity and complex design, detectors are the most frequently attacked components. It was recently shown that two-photon interference from independent light sources can be used to remove any vulnerability from detectors. This new form of detection-safe quantum key distribution (QKD), termed measurement-device-independent (MDI), has been experimentally demonstrated but with modest key rates. Here, we introduce a new pulsed laser seeding technique to obtain high-visibility interference from gain-switched lasers and thereby perform MDI-QKD with unprecedented key rates in excess of 1 megabit per second in the finite-size regime. This represents a two to six orders of magnitude improvement over existing implementations and supports the new scheme as a practical resource for secure quantum communications.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:18
Last Modified: 19 Sep 2017 01:30
DOI: