A demonstration of the principles of quantum key distribution is performed using a single-photon source in a proof of concept test-bed over a distance of 2 km in standard telecommunications optical fiber. The single-photon source was an optically-pumped quantum dot in a microcavity emitting at a wavelength of 895 nm. Characterization of the quantum key distribution parameters was performed at a range of different optical excitation powers. An investigation of the effect of varying the optical excitation power of the quantum dot microcavity on the quantum bit error rate and cryptographic key exchange rate of the system are presented.
@article{arxiv.1004.4754,
title = {Quantum key distribution system in standard telecommunications fiber using a short wavelength single-photon source},
author = {R. J. Collins and P. J. Clarke and V. Fernandez and K. J. Gordon and M. N. Makhonin and J. A. Timpson and A. Tahraoui and M. Hopkinson and A. M. Fox and M. S. Skolnick and G. S. Buller},
journal= {arXiv preprint arXiv:1004.4754},
year = {2010}
}
Comments
Final manuscript version, some grammatical differences from the published version. 26 pages including 7 figures.