Large-alphabet quantum key distribution using energy-time entangled bipartite states

Irfan Ali-Khan*, Curtis J. Broadbent, John C. Howell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

203 Scopus citations

Abstract

We present a protocol for large-alphabet quantum key distribution (QKD) using energy-time entangled biphotons. Binned, high-resolution timing measurements are used to generate a large-alphabet key with over 10 bits of information per photon pair, albeit with large noise. QKD with 5% bit error rate is demonstrated with 4 bits of information per photon pair, where the security of the quantum channel is determined by the visibility of Franson interference fringes. The protocol is easily generalizable to even larger alphabets, and utilizes energy-time entanglement which is robust to transmission over large distances in fiber.

Original languageAmerican English
Article number060503
JournalPhysical Review Letters
Volume98
Issue number6
DOIs
StatePublished - 2007
Externally publishedYes

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