Document Type
Article
Publication Date
2-8-2007
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.
Recommended Citation
I. Ali-Khan, C. J. Broadbent, and J. C. Howell, Large-Alphabet Quantum Key Distribution Using Energy-Time Entangled Bipartite States, Phys. Rev. Lett. 98(6), 060503. https://doi.org/10.1103/PhysRevLett.98.060503
Peer Reviewed
1
Copyright
American Physical Society
Comments
This article was originally published in Physical Review Letters, volume 98, issue 6, in 2007. https://doi.org/10.1103/PhysRevLett.98.060503