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

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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.
Original languageEnglish
Journaln p j Quantum Information
Issue number1
Number of pages6
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

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ID: 152182689