On the security and degradability of gaussian channels

Authors:
Stefano Pirandola;Samuel L. Braunstein;Seth Lloyd
Affiliations:
Research Laboratory of Electronics, MIT, Cambridge, MA;Department of Computer Science, University of York, York, UK;Research Laboratory of Electronics, MIT, Cambridge, MA
Venue:
TQC'09 Proceedings of the 4th international conference on Theory of Quantum Computation, Communication, and Cryptography
Year:
2009

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One-mode quantum Gaussian channels: Structure and quantum capacity

Problems of Information Transmission

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Abstract

We consider the notion of canonical attacks, which are the cryptographic analog of the canonical forms of a one-mode Gaussian channel. Using this notion, we explore the connections between the degradability properties of the channel and its security for quantum key distribution. Finally, we also show some relations between canonical attacks and optimal Gaussian cloners.