Secret key rates of free‐space optical continuous‐variable quantum key distribution

Summary In this letter, we derive the maximal achievable secret key rates for continuous‐variable quantum key distribution (CVQKD) over free‐space optical (FSO) quantum channels. We provide a channel decomposition for FSO‐CVQKD quantum channels and study the SNR (signal‐to‐noise ratio) characteristi...

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Bibliographic Details
Published inInternational journal of communication systems Vol. 32; no. 18
Main Authors Gyongyosi, Laszlo, Imre, Sandor
Format Journal Article
LanguageEnglish
Published Chichester Wiley Subscription Services, Inc 01.12.2019
Subjects
Channels
Continuity (mathematics)
cryptography
networking
Quantum cryptography
quantum key distribution
security
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Summary:Summary In this letter, we derive the maximal achievable secret key rates for continuous‐variable quantum key distribution (CVQKD) over free‐space optical (FSO) quantum channels. We provide a channel decomposition for FSO‐CVQKD quantum channels and study the SNR (signal‐to‐noise ratio) characteristics. The analytical derivations focus particularly on the low‐SNR scenarios. The results are convenient for wireless quantum key distribution and for the quantum Internet. We derive the maximal achievable secret key rates for continuous‐variable quantum key distribution (CVQKD) over free‐space optical (FSO) quantum channels. We provide a channel decomposition for FSO‐CVQKD quantum channels and study the SNR (signal‐to‐noise ratio) characteristics. The analytical derivations focus particularly on the low‐SNR scenarios. The results are convenient for wireless quantum key distribution and for the quantum Internet.
ISSN:1074-5351
1099-1131
DOI:10.1002/dac.4152