Unconditional Security of Time-Energy Entanglement Quantum Key Distribution Using Dual-Basis Interferometry

Unconditional Security of Time-Energy Entanglement Quantum Key Distribution Using Dual-Basis... High-dimensional quantum key distribution (HDQKD) offers the possibility of high secure-key rate with high photon-information efficiency. We consider HDQKD based on the time-energy entanglement produced by spontaneous parametric down-conversion and show that it is secure against collective attacks. Its security rests upon visibility data—obtained from Franson and conjugate-Franson interferometers—that probe photon-pair frequency correlations and arrival-time correlations. From these measurements, an upper bound can be established on the eavesdropper’s Holevo information by translating the Gaussian-state security analysis for continuous-variable quantum key distribution so that it applies to our protocol. We show that visibility data from just the Franson interferometer provides a weaker, but nonetheless useful, secure-key rate lower bound. To handle multiple-pair emissions, we incorporate the decoy-state approach into our protocol. Our results show that over a 200-km transmission distance in optical fiber, time-energy entanglement HDQKD could permit a 700 - bit / sec secure-key rate and a photon information efficiency of 2 secure-key bits per photon coincidence in the key-generation phase using receivers with a 15% system efficiency. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Unconditional Security of Time-Energy Entanglement Quantum Key Distribution Using Dual-Basis Interferometry

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Publisher
American Physical Society (APS)
Copyright
© 2014 American Physical Society
Subject
LETTERS; General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.
ISSN
0031-9007
eISSN
1079-7114
D.O.I.
10.1103/PhysRevLett.112.120506
Publisher site
See Article on Publisher Site

Abstract

High-dimensional quantum key distribution (HDQKD) offers the possibility of high secure-key rate with high photon-information efficiency. We consider HDQKD based on the time-energy entanglement produced by spontaneous parametric down-conversion and show that it is secure against collective attacks. Its security rests upon visibility data—obtained from Franson and conjugate-Franson interferometers—that probe photon-pair frequency correlations and arrival-time correlations. From these measurements, an upper bound can be established on the eavesdropper’s Holevo information by translating the Gaussian-state security analysis for continuous-variable quantum key distribution so that it applies to our protocol. We show that visibility data from just the Franson interferometer provides a weaker, but nonetheless useful, secure-key rate lower bound. To handle multiple-pair emissions, we incorporate the decoy-state approach into our protocol. Our results show that over a 200-km transmission distance in optical fiber, time-energy entanglement HDQKD could permit a 700 - bit / sec secure-key rate and a photon information efficiency of 2 secure-key bits per photon coincidence in the key-generation phase using receivers with a 15% system efficiency.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Mar 26, 2014

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