Experimental Demonstration of a 20-Mbit/s per Channel Free-Space Bi-directional Quantum Communication Link Using Orbital-Angular-Momentum Encoding and Multi-Port Mode Converters

Cong Liu, Kai Pang, Hao Song, Guodong Xie, Jiapeng Zhao, Yongxiong Ren, Haoqian Song, Zhe Zhao, Runzhou Zhang, Long Li, Jing Du, Seyed M. H. Rafsanjani, Guillaume Labroille, Pu Jian, W. Robert,  Boyd, Moshe Tur, Alan E. Willner

 

 

Abstract: We experimentally demonstrate a free-space, bi-directional quantum communication link encoded by two OAM states using multi-port mode converters. We achieve a quantum-symbol-error-rate of ≈ 0.058 for each channel at 20 Mbit/s/channel when OAM mode-spacing is 4.