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Acta Optica Sinica

Orbital-Angular-Momentum-Encoded Measurement-Device-Independent Quantum Key Distributions Under Atmospheric Turbulence

朱卓丹 Zhu Zhuodan, 赵尚弘 Zhao Shanghong, 谷文苑 Gu Wenyuan, 刘菁 Liu Jing, 孙祥祥 Sun Xiangxiang

Published Jan 1, 2018• 1 citation
Publisher
DOI
10.3788/aos201838.1227002

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Free-space communication allows one to use spatial mode encoding, which is susceptible to the effects of diffraction and turbulence. Here, we discuss the optimum communication modes of a system while taking such effects into account. We construct a free-space communication system that encodes information onto the plane-wave (PW) modes of light. We study the performance of this system in the presence of atmospheric turbulence, and compare it with previous results for a system employing orbital-angular-momentum (OAM) encoding. We are able to show that the PW basis is the preferred basis set for communication through atmospheric turbulence for a system with a large Fresnel number product. This study has important implications for high-dimensional quantum key distribution systems.
We describe an experimental implementation of a free-space 11-dimensional communication system using orbital angular momentum (OAM) modes. This system has a maximum measured OAM channel capacity of 2.12 bits/photon. The effects of Kolmogorov thin-phase turbulence on the OAM channel capacity are quantified. We find that increasing the turbulence leads to a degradation of the channel capacity. We are able to mitigate the effects of turbulence by increasing the spacing between detected OAM modes. This study has implications for high-dimensional quantum key distribution (QKD) systems. We describe the sort of QKD system that could be built using our current technology.