Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator

Abstract We present an experimental demonstration of the feasibility of the first 20 + Mb/s Gaussian modulated coherent state continuous variable quantum key distribution system with a locally generated local oscillator at the receiver (LLO-CVQKD). To increase the signal repetition rate, and hence t...

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Autores principales:	Shengjun Ren, Shuai Yang, Adrian Wonfor, Ian White, Richard Penty
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/816e1ebc458e46fe88c50f1e423533c1
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spelling	oai:doaj.org-article:816e1ebc458e46fe88c50f1e423533c12021-12-02T15:38:24ZDemonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator10.1038/s41598-021-88468-12045-2322https://doaj.org/article/816e1ebc458e46fe88c50f1e423533c12021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88468-1https://doaj.org/toc/2045-2322Abstract We present an experimental demonstration of the feasibility of the first 20 + Mb/s Gaussian modulated coherent state continuous variable quantum key distribution system with a locally generated local oscillator at the receiver (LLO-CVQKD). To increase the signal repetition rate, and hence the potential secure key rate, we equip our system with high-performance, wideband devices and design the components to support high repetition rate operation. We have successfully trialed the signal repetition rate as high as 500 MHz. To reduce the system complexity and correct for any phase shift during transmission, reference pulses are interleaved with quantum signals at Alice. Customized monitoring software has been developed, allowing all parameters to be controlled in real-time without any physical setup modification. We introduce a system-level noise model analysis at high bandwidth and propose a new ‘combined-optimization’ technique to optimize system parameters simultaneously to high precision. We use the measured excess noise, to predict that the system is capable of realizing a record 26.9 Mb/s key generation in the asymptotic regime over a 15 km signal mode fibre. We further demonstrate the potential for an even faster implementation.Shengjun RenShuai YangAdrian WonforIan WhiteRichard PentyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shengjun Ren Shuai Yang Adrian Wonfor Ian White Richard Penty Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
description	Abstract We present an experimental demonstration of the feasibility of the first 20 + Mb/s Gaussian modulated coherent state continuous variable quantum key distribution system with a locally generated local oscillator at the receiver (LLO-CVQKD). To increase the signal repetition rate, and hence the potential secure key rate, we equip our system with high-performance, wideband devices and design the components to support high repetition rate operation. We have successfully trialed the signal repetition rate as high as 500 MHz. To reduce the system complexity and correct for any phase shift during transmission, reference pulses are interleaved with quantum signals at Alice. Customized monitoring software has been developed, allowing all parameters to be controlled in real-time without any physical setup modification. We introduce a system-level noise model analysis at high bandwidth and propose a new ‘combined-optimization’ technique to optimize system parameters simultaneously to high precision. We use the measured excess noise, to predict that the system is capable of realizing a record 26.9 Mb/s key generation in the asymptotic regime over a 15 km signal mode fibre. We further demonstrate the potential for an even faster implementation.
format	article
author	Shengjun Ren Shuai Yang Adrian Wonfor Ian White Richard Penty
author_facet	Shengjun Ren Shuai Yang Adrian Wonfor Ian White Richard Penty
author_sort	Shengjun Ren
title	Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
title_short	Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
title_full	Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
title_fullStr	Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
title_full_unstemmed	Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
title_sort	demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/816e1ebc458e46fe88c50f1e423533c1
work_keys_str_mv	AT shengjunren demonstrationofhighspeedandlowcomplexitycontinuousvariablequantumkeydistributionsystemwithlocallocaloscillator AT shuaiyang demonstrationofhighspeedandlowcomplexitycontinuousvariablequantumkeydistributionsystemwithlocallocaloscillator AT adrianwonfor demonstrationofhighspeedandlowcomplexitycontinuousvariablequantumkeydistributionsystemwithlocallocaloscillator AT ianwhite demonstrationofhighspeedandlowcomplexitycontinuousvariablequantumkeydistributionsystemwithlocallocaloscillator AT richardpenty demonstrationofhighspeedandlowcomplexitycontinuousvariablequantumkeydistributionsystemwithlocallocaloscillator
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Demonstration of high-speed and low-complexity continuous variable quantum key distribution system with local local oscillator

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