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 ${\mathrm{LG}}_{\ell p}$ modes (i.e., for $\ell =0$, we encode [“0”, “1”] as [$p=0$, $p=1$], and for $\ell =1$, 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.

© 2018 Optical Society of America

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