Continuous-variable quantum key distribution in non-Markovian channels
- Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto (Finland)
- Dipartimento di Fisica, Universita degli Studi di Trieste, I-34151 Trieste (Italy)
- Dipartimento di Fisica, Universita degli Studi di Milano, I-20133 Milano (Italy)
- 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, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevA.83.042321; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Experimental demonstration of post-selection-based continuous-variable quantum key distribution in the presence of Gaussian noise
Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier