We propose a high-dimensional quantum key distribution (QKD) protocol that employs temporal correlations of entangled photons. The security of the protocol relies on measurements by Alice and Bob in one of two conjugate bases, implemented using dispersive optics. We show that this dispersion-based approach is secure against general coherent attacks. The protocol is additionally compatible with standard fiber telecommunications channels and wavelength division multiplexers. We offer multiple implementations to enhance the transmission rate and describe a heralded qudit source that is easy to implement and enables secret-key generation at up to 100 Mbps at over 2 bits per photon.
@article{arxiv.1210.4501,
title = {High-dimensional quantum key distribution using dispersive optics},
author = {Jacob Mower and Zheshen Zhang and Pierre Desjardins and Catherine Lee and Jeffrey H. Shapiro and Dirk Englund},
journal= {arXiv preprint arXiv:1210.4501},
year = {2015}
}
Comments
5 pages, 3 figures. v2 contains details of security analysis previously left to Supplemental Information (not included in v1)