Large-alphabet time-frequency entangled quantum key distribution by means of time-to-frequency conversion

J. Nunn; L. J. Wright; C. Söller; L. Zhang; I. A. Walmsley; B. J. Smith

doi:10.1364/OE.21.015959

Large-alphabet time-frequency entangled quantum key distribution by means of time-to-frequency conversion

J. Nunn, L. J. Wright, C. Söller, L. Zhang, I. A. Walmsley, B. J. Smith

Department of Physics

Research output: Contribution to journal › Article › peer-review

139 Citations (SciVal)

Abstract

We introduce a novel time-frequency quantum key distribution (TFQKD) scheme based on photon pairs entangled in these two conjugate degrees of freedom. The scheme uses spectral detection and phase modulation to enable measurements in the temporal basis by means of time-to-frequency conversion. This allows large-alphabet encoding to be implemented with realistic components. A general security analysis for TFQKD with binned measurements reveals a close connection with finite-dimensional QKD protocols and enables analysis of the effects of dark counts on the secure key size.

Original language	English
Pages (from-to)	15959-15973
Number of pages	15
Journal	Optics Express
Volume	21
Issue number	13
DOIs	https://doi.org/10.1364/OE.21.015959
Publication status	Published - 1 Jul 2013

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OE.21.015959

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AU - Söller, C.

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AU - Walmsley, I. A.

AU - Smith, B. J.

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AB - We introduce a novel time-frequency quantum key distribution (TFQKD) scheme based on photon pairs entangled in these two conjugate degrees of freedom. The scheme uses spectral detection and phase modulation to enable measurements in the temporal basis by means of time-to-frequency conversion. This allows large-alphabet encoding to be implemented with realistic components. A general security analysis for TFQKD with binned measurements reveals a close connection with finite-dimensional QKD protocols and enables analysis of the effects of dark counts on the secure key size.

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Large-alphabet time-frequency entangled quantum key distribution by means of time-to-frequency conversion

Abstract

ASJC Scopus subject areas

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