A Programmable Quantum Router and Its Linear Optical Implementation
Jinsong Kuang, Xiaoyang Fang, Jie Zhou, Wenjuan Li, Jiong Zhao · 2020
In this paper, we propose a linear optical implementation scheme of the quantum router. A programming unit is designed. The quantum router makes use of devices which are experimentally realized easily. The signal can be routed into a superposition of output modes through the routing operation, and the spatial degree of freedom of each output mode is related to the control parameter. In addition, the strategy of multistage routing is also exploited on the basis of this router model, and it can exponentially expand the number of output ports. The quantum router is deterministic, rather than probabilistic, no matter how many output ports the quantum router has.