Realization of single-photon transport in one-dimensional coupled-resonator waveguides via phase control

Abstract

We study theoretically the influence of the phase difference of the coupling strength changes on the transport of a single-photon in coupled-resonator waveguides (CRWs). Two cases are considered: single-photon transport in a one-dimensional CRW with nonlocal coupling to a cavity, and a single-photon in a waveguide consisting of two coupled semi-infinite CRWs, which are coupled to a cavity and two cavities. The results show that the phase difference of the coupling strength can not only improve the conversion efficiency of single-photon transport in CRWs but also can adjust the irregular energy band spectrum to become regular. This will provide an important physical parameter for the experimental realization of quantum solid-state devices such as quantum switches and quantum routers.