Continuous-variable quantum key distribution in non-Markovian channels

Ruggero Vasile, Stefano Olivares, Matteo G. A Paris, Sabrina Maniscalco

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123 Citations (Scopus)
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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?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.
Original languageEnglish
Article number042321
Number of pages6
JournalPhysical Review A
Issue number4
Publication statusPublished - 15 Apr 2011


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