dorsal/arxiv
View SchemaContinuous Variable Quantum Cryptography using Two-Way Quantum Communication
| Authors | Stefano Pirandola, Stefano Mancini, Seth Lloyd, Samuel L. Braunstein |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0611167 |
| URL | https://arxiv.org/abs/quant-ph/0611167 |
| DOI | 10.1038/nphys1018 |
| Journal | Nature Physics 4, 726 - 730 (2008) |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
Quantum 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.
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"abstract": "Quantum cryptography has been recently extended to continuous variable\nsystems, e.g., the bosonic modes of the electromagnetic field. In particular,\nseveral cryptographic protocols have been proposed and experimentally\nimplemented using bosonic modes with Gaussian statistics. Such protocols have\nshown the possibility of reaching very high secret-key rates, even in the\npresence of strong losses in the quantum communication channel. Despite this\nrobustness to loss, their security can be affected by more general attacks\nwhere extra Gaussian noise is introduced by the eavesdropper. In this general\nscenario we show a \"hardware solution\" for enhancing the security thresholds of\nthese protocols. This is possible by extending them to a two-way quantum\ncommunication where subsequent uses of the quantum channel are suitably\ncombined. In the resulting two-way schemes, one of the honest parties assists\nthe secret encoding of the other with the chance of a non-trivial superadditive\nenhancement of the security thresholds. Such results enable the extension of\nquantum cryptography to more complex quantum communications.",
"arxiv_id": "quant-ph/0611167",
"authors": [
"Stefano Pirandola",
"Stefano Mancini",
"Seth Lloyd",
"Samuel L. Braunstein"
],
"categories": [
"quant-ph",
"cs.CR",
"cs.IT",
"math.IT",
"physics.optics"
],
"doi": "10.1038/nphys1018",
"journal_ref": "Nature Physics 4, 726 - 730 (2008)",
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Continuous Variable Quantum Cryptography using Two-Way Quantum Communication",
"url": "https://arxiv.org/abs/quant-ph/0611167"
},
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