Continuous Variable Quantum Cryptography using Two-Way Quantum Communication

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dc.creatorPirandola, Stefano
dc.creatorMancini, Stefano
dc.creatorLloyd, Seth
dc.creatorBraunstein, Samuel L.
dc.date2006-11-15
dc.date2008-12-03
dc.date.accessioned2026-07-07T12:08:41Z
dc.date.available2026-07-07T12:08:41Z
dc.descriptionQuantum cryptography has been recently extended to continuous variable systems, e.g., the bosonic modes of the electromagnetic field. In particular, several cryptographic protocols have been proposed and experimentally implemented using bosonic modes with Gaussian statistics. Such protocols have shown the possibility of reaching very high secret-key rates, even in the presence of strong losses in the quantum communication channel. Despite this robustness to loss, their security can be affected by more general attacks where extra Gaussian noise is introduced by the eavesdropper. In this general scenario we show a "hardware solution" for enhancing the security thresholds of these protocols. This is possible by extending them to a two-way quantum communication where subsequent uses of the quantum channel are suitably combined. In the resulting two-way schemes, one of the honest parties assists the secret encoding of the other with the chance of a non-trivial superadditive enhancement of the security thresholds. Such results enable the extension of quantum cryptography to more complex quantum communications.
dc.description12 pages, 7 figures, REVTeX
dc.identifierhttps://arxiv.org/abs/quant-ph/0611167
dc.identifierhttp://arxiv.org/abs/quant-ph/0611167
dc.identifierNature Physics 4, 726 - 730 (2008)
dc.identifierdoi:10.1038/nphys1018
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/209406
dc.subjectQuantum Physics
dc.subjectCryptography and Security
dc.subjectInformation Theory
dc.subjectOptics
dc.titleContinuous Variable Quantum Cryptography using Two-Way Quantum Communication
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