Coherent frequency bridge between visible and telecommunications band of vortex light
Abstract
In quantum communications, vortex photons can encode higher-dimensional quantum states and build high-dimensional communication networks (HDCNs). The interfaces that connect different wavelengths are significant in HDCNs. We construct a coherent orbital angular momentum (OAM) frequency bridge via difference frequency conversion in a nonlinear bulk crystal for HDCNs. Using a single resonant cavity, maximum quantum conversion efficiencies from visible to infrared are 36\%, 15\%, and 7.8\% for topological charges of 0,1, and 2, respectively. The average fidelity obtained using quantum state tomography for the down-converted infrared OAM-state of topological charge 1 is 96.51\%. We also prove that the OAM is conserved in this process by measuring visible and infrared interference patterns. This coherent OAM frequency-down conversion bridge represents a basis for an interface between two high-dimensional quantum systems operating with different spectra.
Keywords
Cite
@article{arxiv.1707.08787,
title = {Coherent frequency bridge between visible and telecommunications band of vortex light},
author = {Shi-long Liu and Shi-kai Liu and Yin-hai Li and Shuai shi and Zhi-yuan Zhou and Bao-sen Shi},
journal= {arXiv preprint arXiv:1707.08787},
year = {2017}
}
Comments
9 pages, 4 figures 43 references