Continuous-variable quantum key distribution in non-Markovian channels

Ruggero Vasile, Stefano Olivares, MatteoG. A. Paris, and Sabrina Maniscalco
Phys. Rev. A 83, 042321 – Published 15 April 2011

Abstract

We address continuous-variable quantum key distribution (QKD) in non-Markovian lossy channels and show how the non-Markovian features may be exploited to enhance security and/or to detect the presence and the position of an eavesdropper along the transmission line. In particular, we suggest a coherent-state QKD protocol which is secure against Gaussian individual attacks based on optimal 12 asymmetric cloning machines for arbitrarily low values of the overall transmission line. The scheme relies on specific non-Markovian properties, and cannot be implemented in ordinary Markovian channels characterized by uniform losses. Our results give a clear indication of the potential impact of non-Markovian effects in QKD.

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  • Received 1 November 2010

DOI:https://doi.org/10.1103/PhysRevA.83.042321

©2011 American Physical Society

Authors & Affiliations

Ruggero Vasile1,*, Stefano Olivares2,3,4,†, MatteoG. A. Paris4,‡, and Sabrina Maniscalco5,1,§

  • 1Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland
  • 2Dipartimento di Fisica, Università degli Studi di Trieste, I-34151 Trieste, Italy
  • 3CNISM, Unitá di Ricerca di Milano Università, I-20133 Milano, Italy
  • 4Dipartimento di Fisica, Università degli Studi di Milano, I-20133 Milano, Italy
  • 5School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom

  • *ruggero.vasile@utu.fi
  • stefano.olivares@ts.infn.it
  • matteo.paris@fisica.unimi.it
  • §s.maniscalco@hw.ac.uk

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Issue

Vol. 83, Iss. 4 — April 2011

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