论文标题
水下量子通信在30米的水槽上
Underwater quantum communication over a 30-meter flume tank
论文作者
论文摘要
最近，使用极化和轨道角动量探索了水下量子通信。在这里，我们表明，在空间结构的模式，例如，携带极化和轨道角动量的光束的连贯叠加也可用于水下量子加密。我们还使用两极分化的自由度在具有各种长度的水下通道中进行量子通信，最高$ 30 $。水下通道被证明是建立量子通信的困难环境，因为水下光学湍流会导致梁的大量横梁徘徊和扭曲。但是，与湍流相关的误差不会导致错误率高于与极化和空间结构光子的量子通信链路中建立正键的阈值。还研究了使用极化断层扫描的不同距离研究水下通道对空间结构模式的影响。
Underwater quantum communication has recently been explored using polarization and orbital angular momentum. Here, we show that spatially structured modes, e.g., a coherent superposition of beams carrying both polarization and orbital angular momentum, can also be used for underwater quantum cryptography. We also use the polarization degree of freedom for quantum communication in an underwater channel having various lengths, up to $30$ meters. The underwater channel proves to be a difficult environment for establishing quantum communication as underwater optical turbulence results in significant beam wandering and distortions. However, the errors associated to the turbulence do not result in error rates above the threshold for establishing a positive key in a quantum communication link with both the polarization and spatially structured photons. The impact of the underwater channel on the spatially structured modes is also investigated at different distances using polarization tomography.
