Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers

Abstract Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication that eliminates all detector side-channels, although is currently limited by implementation complexity and low secure key rates. Here, we introduce a simple and compact MDI-QKD...

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Autores principales:	R. I. Woodward, Y. S. Lo, M. Pittaluga, M. Minder, T. K. Paraïso, M. Lucamarini, Z. L. Yuan, A. J. Shields
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/59782089c6b64576ac6d285f33b5bb16
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spelling	oai:doaj.org-article:59782089c6b64576ac6d285f33b5bb162021-12-02T14:37:40ZGigahertz measurement-device-independent quantum key distribution using directly modulated lasers10.1038/s41534-021-00394-22056-6387https://doaj.org/article/59782089c6b64576ac6d285f33b5bb162021-04-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00394-2https://doaj.org/toc/2056-6387Abstract Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication that eliminates all detector side-channels, although is currently limited by implementation complexity and low secure key rates. Here, we introduce a simple and compact MDI-QKD system design at gigahertz clock rates with enhanced resilience to laser fluctuations—thus enabling free-running semiconductor laser sources to be employed without spectral or phase feedback. This is achieved using direct laser modulation, carefully exploiting gain-switching and injection-locking laser dynamics to encode phase-modulated time-bin bits. Our design enables secure key rates that improve upon the state of the art by an order of magnitude, up to 8 bps at 54 dB channel loss and 2 kbps in the finite-size regime for 30 dB channel loss. This greatly simplified MDI-QKD system design and proof-of-principle demonstration shows that MDI-QKD is a practical, high-performance solution for future quantum communication networks.R. I. WoodwardY. S. LoM. PittalugaM. MinderT. K. ParaïsoM. LucamariniZ. L. YuanA. J. ShieldsNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 R. I. Woodward Y. S. Lo M. Pittaluga M. Minder T. K. Paraïso M. Lucamarini Z. L. Yuan A. J. Shields Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
description	Abstract Measurement-device-independent quantum key distribution (MDI-QKD) is a technique for quantum-secured communication that eliminates all detector side-channels, although is currently limited by implementation complexity and low secure key rates. Here, we introduce a simple and compact MDI-QKD system design at gigahertz clock rates with enhanced resilience to laser fluctuations—thus enabling free-running semiconductor laser sources to be employed without spectral or phase feedback. This is achieved using direct laser modulation, carefully exploiting gain-switching and injection-locking laser dynamics to encode phase-modulated time-bin bits. Our design enables secure key rates that improve upon the state of the art by an order of magnitude, up to 8 bps at 54 dB channel loss and 2 kbps in the finite-size regime for 30 dB channel loss. This greatly simplified MDI-QKD system design and proof-of-principle demonstration shows that MDI-QKD is a practical, high-performance solution for future quantum communication networks.
format	article
author	R. I. Woodward Y. S. Lo M. Pittaluga M. Minder T. K. Paraïso M. Lucamarini Z. L. Yuan A. J. Shields
author_facet	R. I. Woodward Y. S. Lo M. Pittaluga M. Minder T. K. Paraïso M. Lucamarini Z. L. Yuan A. J. Shields
author_sort	R. I. Woodward
title	Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
title_short	Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
title_full	Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
title_fullStr	Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
title_full_unstemmed	Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
title_sort	gigahertz measurement-device-independent quantum key distribution using directly modulated lasers
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/59782089c6b64576ac6d285f33b5bb16
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Gigahertz measurement-device-independent quantum key distribution using directly modulated lasers

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