TY - JOUR
T1 - Large-alphabet quantum key distribution using energy-time entangled bipartite states
AU - Ali-Khan, Irfan
AU - Broadbent, Curtis J.
AU - Howell, John C.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33846942245&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.98.060503
DO - 10.1103/PhysRevLett.98.060503
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AN - SCOPUS:33846942245
SN - 0031-9007
VL - 98
JO - Physical Review Letters
JF - Physical Review Letters
IS - 6
M1 - 060503
ER -