Phys. Rev. Lett. 98, 060503 (2007) [4 pages]Large-Alphabet Quantum Key Distribution Using Energy-Time Entangled Bipartite StatesReceived 14 July 2006; revised 27 November 2006; published 8 February 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.060503
DOI:
10.1103/PhysRevLett.98.060503
PACS:
03.67.Dd, 03.67.Hk, 42.50.Dv
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