We propose a schematic setup of quantum key distribution (QKD) with an improved secret key rate based on high-dimensional quantum states. Two degrees-of-freedom of a single photon, orbital angular momentum modes, and multi-path modes, are used to encode secret key information. Its practical implementation consists of optical elements that are within the reach of current technologies such as a multiport interferometer. We show that the proposed feasible protocol has improved the secret key rate with much sophistication compared to the previous 2-dimensional protocol known as the detector-device-independent QKD.
@article{arxiv.1901.09478,
title = {Efficient High-dimensional Quantum Key Distribution with Hybrid Encoding},
author = {Yonggi Jo and Hee Su Park and Seung-Woo Lee and Wonmin Son},
journal= {arXiv preprint arXiv:1901.09478},
year = {2019}
}