We report on the theoretical design and simulation of a photonic quantum circuit that operates as a single-photon, two-qubit swap gate. In this approach, the circuit is implemented in Titanium indiffused LiNbO₃ channel waveguides, and polarization and spatial encoding are utilized to realize the qubits. A set of basic components comprising a dual periodically poled waveguide for two simultaneous Type-0 and Type-I non-linear interactions, as well as the passive routing and active electro-optically controllable devices, are the main building blocks in this circuit. Simulations are carried out by making use of the numerical beam propagation method incorporated within RSoft program package.

我们报告了作为单光子，两个量子位交换门工作的光子量子电路的理论设计和仿真。在这种方法中，该电路在钛扩散的LiNbO ₃通道波导中实现，并且利用极化和空间编码来实现量子位。一组基本组件包括用于两个同时发生的Type-0和Type-I非线性相互作用的双周期极化波导，以及无源路由和有源电光可控设备，是该电路的主要构建模块。通过使用RSoft程序包中包含的数字光束传播方法进行仿真。