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Continuous-variable measurement-device-independent quantum key distribution: Composable security against coherent attacks

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JournalPhysical Review A
DateSubmitted - 18 Jul 2017
DateAccepted/In press - 2 May 2018
DatePublished (current) - 29 May 2018
Issue number5
Volume97
Number of pages10
Pages (from-to)1-10
Original languageEnglish

Abstract

We present a rigorous security analysis of continuous-variable measurement-device-independent quantum key distribution (CVMDI QKD) in a finite-size scenario. The security proof is obtained in two steps: by first assessing the security against collective Gaussian attacks, and then extending to the most general class of coherent attacks via the Gaussian de Finetti reduction. Our result combines recent state-of-the-art security proofs for CVQKD with findings about min-entropy calculus and parameter estimation. In doing so, we improve the finite-size estimate of the secret key rate. Our conclusions confirm that CV MDI protocols allow for high rates on the metropolitan scale, and may achieve a nonzero secret key rate against the most general class of coherent attacks after 10^7–10^9 quantum signal transmissions, depending on loss and noise, and on the required level of security.

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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.

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