利用光涡旋实现同时消息传递协议
Implementation of a simultaneous message passing protocol using optical vortices
摘要：
光学量子门的实现是以引入非经典光源为代价的，非经典光源的光子通量低，因此采集时间长。量子模拟光闸结合了量子系统的优点与使用强光束的便利性。在这里，我们关注的是一个控制SWAP（C-SWAP）门使用结构光的工具的经典实现。c-SWAP门是一个三量子比特门，其中一个输入量子比特控制其他两个量子比特之间的信息交换。我们使用拉盖尔-高斯光束来实现c-SWAP门，并展示了其主要应用之一：比较两个信号而不显示其内容，即，一种同步消息传递协议。我们实现了信号比较测量与kHz的调制速度，使用一个数字的MEMS器件作为空间光调制器。我们的系统能够进行动态误差分析和归一化过程，这克服了数据后处理的必要性，大大减少了比较时间。
英文摘要：
The implementation of optical quantum gates comes at the cost of incorporating a source of nonclassical light, which suffers from a low flux of photons, and thus, long acquisition times. Quantum-mimetic optical gates combine the benefits of quantum systems with the convenience of using intense light beams. Here, we are concerned with the classical implementation of a controlled-SWAP (c-SWAP) gate using the tools of structured light. A c-SWAP gate is a three-qubit gate, where one of the input qubits controls the exchange of information between the other two qubits. We use Laguerre-Gauss beams to realize the c-SWAP gate and demonstrate one of its primary applications: the comparison of two signals without revealing their content, i.e., a simultaneous message-passing protocol. We achieve signal-comparison measurements with modulation speeds of kHz using a digital micromirror device as a spatial light modulator. Our system is capable of performing dynamic error analysis and a normalization procedure, which overcomes the necessity of data postprocessing and largely reduces comparison times.
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