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Conference on Lasers and Electro-Optics

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 Ran Song, Guodong Xie, Jiapeng Zhao, Yongxiong Ren, Haoqian Song, Zhe Zhao, Runzhou Zhang, Long Li, Jing Lin Du, Seyed Mohammad Hashemi Rafsanjani, Guillaume Labroille, Pu Jian, Robert W. Boyd, Moshe Tur, Alan Eli Willner

Published Jan 1, 2018• 3 citations
Publisher

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.
DOI
10.1364/cleo_at.2018.jth2a.15

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We experimentally demonstrate a 10 Mbit/s free-space quantum communication link using data encoding on orthogonal Laguerre–Gaussian (LG) modes with the same azimuthal index but different radial indices. Data encoding on two LGℓp modes (i.e., for ℓ=0, we encode [“0”, “1”] as [p=0, p=1], and for ℓ=1, we encode [“0”, “1”] as [p=0, p=1]) is demonstrated by employing directly modulated laser diodes and helical phase holograms. The quantum symbol error rate (QSER) of <5% is achieved at an encoding rate of 10 Mbit/s. Moreover, the influence of the circle radius (R) of the receiver phase pattern on registered photon rates and QSERs is investigated. Our results show that a receiver phase pattern whose R does not match the beam size of the LG modes would induce higher cross talk between the two encoded quantum branches.