Long-distance continuous-variable measurement-device-independent quantum key distribution with post-selection

Kieran N. Wilkinson; Panagiotis Papanastasiou; Carlo Ottaviani; Tobias Gehring; Stefano Pirandola

doi:10.1103/PhysRevResearch.2.033424

Long-distance continuous-variable measurement-device-independent quantum key distribution with post-selection

Kieran N. Wilkinson, Panagiotis Papanastasiou, Carlo Ottaviani, Tobias Gehring, Stefano Pirandola

Computer Science

Research output: Contribution to journal › Article › peer-review

Abstract

We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution (QKD) in which we employ post-selection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for general transmissivity and thermal noise variance of each link, in which we assume an eavesdropper performs a collective attack and controls the excess thermal noise in the channels. The introduction of post-selection enables the parties to sustain a secret key rate over distances exceeding those of existing CV-MDI protocols. In the worst-case scenario in which the relay is positioned equidistant between them, we find that the parties may communicate securely over a range of \SI{14}{\km} in standard optical fiber. Our protocol helps to overcome the rate-distance limitations of previously proposed CV-MDI protocols while maintaining many of their advantages.

Original language	English
Article number	033424
Number of pages	11
Journal	Physical Review Research
Volume	2
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevResearch.2.033424
Publication status	Published - 16 Sept 2020

Bibliographical note

12 pages, 7 figures

Keywords

quant-ph

Access to Document

10.1103/PhysRevResearch.2.033424

PhysRevResearch.2.033424Final published version, 637 KBLicence: CC BY

Cite this

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title = "Long-distance continuous-variable measurement-device-independent quantum key distribution with post-selection",

abstract = " We introduce a robust scheme for long-distance continuous-variable (CV) measurement-device-independent (MDI) quantum key distribution (QKD) in which we employ post-selection between distant parties communicating through the medium of an untrusted relay. We perform a security analysis that allows for general transmissivity and thermal noise variance of each link, in which we assume an eavesdropper performs a collective attack and controls the excess thermal noise in the channels. The introduction of post-selection enables the parties to sustain a secret key rate over distances exceeding those of existing CV-MDI protocols. In the worst-case scenario in which the relay is positioned equidistant between them, we find that the parties may communicate securely over a range of \SI{14}{\km} in standard optical fiber. Our protocol helps to overcome the rate-distance limitations of previously proposed CV-MDI protocols while maintaining many of their advantages. ",

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AU - Gehring, Tobias

AU - Pirandola, Stefano

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