Continuous-variable quantum key distribution in non-Markovian channels

Journal Article · Fri Apr 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.042321· OSTI ID:21544588

Vasile, Ruggero ^[1]; Olivares, Stefano ^[2]; Paris, MatteoG A ^[3]; Maniscalco, Sabrina ^[4]

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1. Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto (Finland)
2. Dipartimento di Fisica, Universita degli Studi di Trieste, I-34151 Trieste (Italy)
3. Dipartimento di Fisica, Universita degli Studi di Milano, I-20133 Milano (Italy)
4. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

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 1{yields}2 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.

• OSTI ID: 21544588
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
COMMUNICATIONS
CRYPTOGRAPHY
DATA TRANSMISSION
INFORMATION
MARKOV PROCESS
QUANTUM CRYPTOGRAPHY
QUANTUM INFORMATION
SECURITY
STOCHASTIC PROCESSES