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Two-dimensional distributed-phase-reference protocol for quantum key distribution.

ABSTRACT: Quantum key distribution (QKD) and quantum communication enable the secure exchange of information between remote parties. Currently, the distributed-phase-reference (DPR) protocols, which are based on weak coherent pulses, are among the most practical solutions for long-range QKD. During the last 10 years, long-distance fiber-based DPR systems have been successfully demonstrated, although fundamental obstacles such as intrinsic channel losses limit their performance. Here, we introduce the first two-dimensional DPR-QKD protocol in which information is encoded in the time and phase of weak coherent pulses. The ability of extracting two bits of information per detection event, enables a higher secret key rate in specific realistic network scenarios. Moreover, despite the use of more dimensions, the proposed protocol remains simple, practical, and fully integrable.

SUBMITTER: Bacco D

PROVIDER: S-EPMC5177871 | biostudies-other | 2016 Dec

REPOSITORIES: biostudies-other

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Two-dimensional distributed-phase-reference protocol for quantum key distribution.

Bacco Davide D Christensen Jesper Bjerge JB Castaneda Mario A Usuga MA Ding Yunhong Y Forchhammer Søren S Rottwitt Karsten K Oxenløwe Leif Katsuo LK

Scientific reports 20161222

Quantum key distribution (QKD) and quantum communication enable the secure exchange of information between remote parties. Currently, the distributed-phase-reference (DPR) protocols, which are based on weak coherent pulses, are among the most practical solutions for long-range QKD. During the last 10 years, long-distance fiber-based DPR systems have been successfully demonstrated, although fundamental obstacles such as intrinsic channel losses limit their performance. Here, we introduce the firs ...[more]

PMID: 28004821

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