Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels

Panagiotis Papanastasiou; Cosmo Lupo; Christian Weedbrook; Stefano Pirandola

doi:10.1103/PhysRevA.98.012340

Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels

Panagiotis Papanastasiou, Cosmo Lupo, Christian Weedbrook, Stefano Pirandola

Computer Science

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

Abstract

We consider discrete-alphabet encoding schemes for coherent-state quantum key distribution. The sender encodes the letters of a finite-size alphabet into coherent states whose amplitudes are symmetrically distributed on a circle centered in the origin of the phase space. We study the asymptotic performance of this phase-encoded coherent-state protocol in direct and reverse reconciliation assuming both loss and thermal noise in the communication channel. In particular, we show that using just four phase-shifted coherent states is sufficient for generating secret key rates of the order of $4 \times 10^{-3}$ bits per channel use at about 15 dB loss in the presence of realistic excess noise.

Original language	English
Article number	012340
Pages (from-to)	1-8
Number of pages	8
Journal	Phys. Rev. A
Volume	98
DOIs	https://doi.org/10.1103/PhysRevA.98.012340
Publication status	Published - 31 Jul 2018

Bibliographical note

©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. 8 pages. 7 figures

Keywords

quant-ph
physics.optics

Access to Document

10.1103/PhysRevA.98.012340

1803.02495v1
©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.
Accepted author manuscript, 221 KB

Cite this

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