Complete elimination of information leakage in continuous-variable quantum communication channels

Abstract

In all lossy communication channels realized to date, information is inevitably leaked to a potential eavesdropper. Here we present a communication protocol that does not allow for any information leakage to a potential eavesdropper in a purely lossy channel. By encoding information into a restricted Gaussian alphabet of squeezed states we show, both theoretically and experimentally, that the Holevo information between the eavesdropper and the intended recipient can be exactly zero in a purely lossy channel while minimized in a noisy channel. This result is of fundamental interest, but might also have practical implications in extending the distance of secure quantum key distribution.

9 pages, 5 figures

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• Continuous-variable quantum communication
• Simple and loss-tolerant free-space QKD using a squeezed laser
• Practical quantum secure direct communication with squeezed states
• Quantum limits on noise for a class of nonlinear amplifiers
• Classical-Quantum Dual Encoding for Laser Communications in Space
• Extended analysis of distillation and purification of squeezed states of light
• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
• Coupled three-mode squeezed vacuum: Gaussian steering and remote generation of Wigner negativity
• Minimization of information leakage in continuous-variable quantum key distribution