Demonstration of a 10 Mbit/s quantum communication link by encoding data on two Laguerre–Gaussian modes with different radial indices

Kai Pang, Cong Liu, Guodong Xie, Yongxiong Ren, Zhe Zhao, Runzhou Zhang, Yinwen Cao, Jiapeng Zhao, Haoqian Song, Hao Song, Long Li, Ari N. Willner, Moshe Tur, Robert W. Boyd, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)5639-5642
Number of pages4
JournalOptics Letters
Volume43
Issue number22
DOIs
StatePublished - 15 Nov 2018

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