Gaussian one-way thermal quantum cryptography with finite-size effects

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We study the impact of finite-size effects on the security of thermal one-way quantum cryptography. Our approach considers coherent/squeezed states at the preparation stage, on the top of which the sender adds trusted thermal noise. We compute the key rate incorporating finite-size effects, and we obtain the security threshold at different frequencies. As expected finite-size effects deteriorate the performance of thermal quantum cryptography. Our analysis is useful to quantify the impact of this degradation on relevant parameters like tolerable attenuation, transmission frequencies at which one can achieve security.
Original languageEnglish
Article number032314
Pages (from-to)1-9
Number of pages9
JournalPhysical Review A
Publication statusPublished - 11 Sept 2018

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©2018 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

REVTeX. 9 pages, 4 figures


  • quant-ph

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