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Large-alphabet time-frequency entangled quantum key distribution by means of time-to-frequency conversionJ. Nunn, L. J. Wright, C. Söller, L. Zhang, I. A. Walmsley, and B. J. Smith »View Author Affiliations
J. Nunn,^{1}
L. J. Wright,^{1}
C. Söller,^{1,}^{2}
L. Zhang,^{3}
I. A. Walmsley,^{1}
and B. J. Smith^{1,}^{*}
^{1}Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK ^{2}Current address: Heraeus Noblelight GmbH, Heraeusstraße 12-14, 63450 Hanau, Germany ^{3}Bldg. 99, Max Planck Research Department for Structural Dynamics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany ^{*}Corresponding author: b.smith1@physics.ox.ac.uk |
Optics Express, Vol. 21, Issue 13, pp. 15959-15973 (2013)
http://dx.doi.org/10.1364/OE.21.015959
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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.
© 2013 OSA
OCIS Codes
(060.4080) Fiber optics and optical communications : Modulation
(060.4230) Fiber optics and optical communications : Multiplexing
(060.4510) Fiber optics and optical communications : Optical communications
(060.5060) Fiber optics and optical communications : Phase modulation
(270.5570) Quantum optics : Quantum detectors
(060.5565) Fiber optics and optical communications : Quantum communications
(270.5568) Quantum optics : Quantum cryptography
(270.5585) Quantum optics : Quantum information and processing
ToC Category:
Quantum Optics
History
Original Manuscript: May 6, 2013
Revised Manuscript: June 19, 2013
Manuscript Accepted: June 20, 2013
Published: June 26, 2013
Citation
J. Nunn, L. J. Wright, C. Söller, L. Zhang, I. A. Walmsley, and B. J. Smith, "Large-alphabet time-frequency entangled quantum key distribution by means of time-to-frequency conversion," Opt. Express 21, 15959-15973 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-13-15959
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