Large-Alphabet Quantum Key Distribution Using Energy-Time Entangled Bipartite States | Zendy

I. Ali-Khan | Zendy; Curtis J. Broadbent | Zendy; John C. Howell | Zendy

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Large-Alphabet Quantum Key Distribution Using Energy-Time Entangled Bipartite States

Author(s) -

I. Ali-Khan,

Curtis J. Broadbent,

John C. Howell

Publication year - 2007

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.98.060503

Subject(s) - quantum key distribution , physics , quantum entanglement , energy (signal processing) , photon , computer science , quantum channel , quantum information science , quantum mechanics , quantum

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.

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