Single-End Adaptive Optics Compensation for Emulated Turbulence in a Bi-Directional 10-Mbit/s per Channel Free-Space Quantum Communication Link Using Orbital-Angular-Momentum Encoding
Single-End Adaptive Optics Compensation for Emulated Turbulence in a Bi-Directional 10-Mbit/s per Channel Free-Space Quantum Communication Link Using Orbital-Angular-Momentum Encoding
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DOI：
10.34133/2019/8326701
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发表时间：
2019-01-01
期刊：
影响因子：
11
通讯作者：
Willner, Alan E.
中科院分区：
文献类型：
--
作者：
Liu, Cong;Pang, Kai;Willner, Alan E.
实验证明了单端自适应 - 启示（AO）模块，以减轻双向量子通信链路中的模拟大气湍流效应，该量子通信链路采用轨道角动量（OAM）进行数据编码。经典的高斯梁被用作探针，以基于检测到的波前变形在链路的正向方向上检测湍流引起的波前变形，位于链路一端的AO系统用于同时补偿前进和前进和。向后通道。具体而言，使用模拟的湍流和探针打开时，随着AO的缓解，携带OAM L = 1的光子的模式纯度通过与21％相似。我们还使用OAM {L = -1，+2}编码数据时，我们还测量了性能，分别以每个通道为10 mbit/s，分别为前向和向后通道中的{l = -2，+1}，每个脉冲一个光子一个光子平均。在这种情况下，我们发现AO系统可以降低湍流效应，使量子符号率（QSER）相似，使量子符号率（QSER）与76％相似，并且类似于74％，在单向和双向案例中，这两个通道都相似， 分别。在双向情况下，观察到相反方向通道的QSER改善。
A single-end adaptive-optics (AO) module is experimentally demonstrated to mitigate the emulated atmospheric turbulence effects in a bi-directional quantum communication link, which employs orbital angular momentum (OAM) for data encoding. A classical Gaussian beam is used as a probe to detect the turbulence-induced wavefront distortion in the forward direction of the link Based on the detected wavefront distortion, an AO system located on one end of the link is used to simultaneously compensate for the forward and backward channels. Specifically, with emulated turbulence and when the probe is turned on, the mode purity of photons carrying OAM l = 1 is improved by similar to 21 % with AO mitigation. We also measured the performance when encoding data using OAM {l = -1, +2} and {l = -2, +1} in the forward and backward channels, respectively, at 10 Mbit/s per channel with one photon per pulse on average. For this case, we found that the AO system could reduce the turbulence effects increased quantum-symbol-error-rate (QSER) by similar to 76 % and similar to 74 %, for both channels in the uni-directional and bi-directional cases, respectively. Similar QSER improvement is observed for the opposite direction channels in the bi-directional case.