A tunable single photon quantum router

Abstract

We propose an efficient single-photon router comprising two resonator waveguide channels coupled by several sequential cavities with embedded three-level atoms. We show that the system can operate as a perfect four-way single-photon switch. We also demonstrate that an incident single-photon propagating in one of the waveguides can be routed into one or the other output channels; such routing can be controlled by the external classical electromagnetic field driving the atoms. We argue that, under appropriate conditions, the efficiency of such routing can be close to 100\% within a broad operational bandwidth, suggesting various applications in photonics.

8 pages, 8 figures

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• Multimode interference induced optical nonreciprocity and routing in an optical microcavity
• Chiral quantum router with Rydberg atoms
• Quantum router of silicon-vacancy centers via a diamond waveguide
• Routing single photons with quantum emitters coupled to nanostructures