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Research in Optical Sciences

Quantum Communication Using Time-energy Entangled Photons

Zheshen Zhang, Jacob Mower, Catherine Lee, Tian Zhong, Franco N. C. Wong, Jeffrey H. Shapiro, Dirk Englund

Published Jan 1, 2014• 0 citations
Publisher

Abstract

Single-photon high-dimensional quantum communication boosts photon efficiency and throughput. We report two time-energy-entanglement based quantum key distribution experiments — one using dispersive optics, the other Franson interferometry — with proven security against collective attacks.
DOI
10.1364/qim.2014.qtu1b.2

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Quantum key distribution (QKD) enables participants to exchange secret information over long distances with unconditional security. However, the performance of today's QKD systems is subject to hardware limitations, such as those of available nonclassical-light sources and single-photon detectors. By encoding photons in high-dimensional states, the rate of generating secure information under these technical constraints can be maximized. Here, we demonstrate a complete time-energy entanglement-based QKD system with proven security against the broad class of arbitrary collective attacks. The security of the system is based on nonlocal dispersion cancellation between two time-energy entangled photons. This resource-efficient QKD system is implemented at telecommunications wavelength, is suitable for optical fiber and free-space links, and is compatible with wavelength-division multiplexing.