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Frequency selectivity of routing signals in quantum channels is of great significance for a quantum optical network. We have proposed a novel tunable bandpass router constructed by two waveguides linked mediately via a driven three-level emitter. The routing properties in the output port are investigated theoretically by using the real-space Hamiltonian. Numerical results show that the continuous central frequencies on demand of routing photons can be manipulated almost linearly by tuning the driving field, and high routing efficiencies of resonance transmission can be achieved via reflection feedback. The proposed routing system could be exploited potentially in designing other quantum optical devices and quantum information processing. [ABSTRACT FROM AUTHOR]

Nonreciprocal light transport is of great importance due to its potential applications in optical communication. We investigate theoretically the unidirectional reflectionlessness behaviors of single photons in a waveguide system coupled with whispering-gallery-mode microresonators. Numerical results show that multi-band unidirectional reflectionlessness can be effectively implemented at the exceptional points by adjusting asymmetric intermode backscatterings of the coupled resonators, and reflectionless frequency-band number increased by multiplication with coupled resonators is also predicted. This suggests a novel multi-band device to effectively perform single-photon unidirectional reflectionlessness, which provides possible applications in quantum communication for designing high-efficiency optical filters, diodes, and so on. [ABSTRACT FROM AUTHOR]

High-efficiency routing of photon signals between different quantum channels is of great importance for a quantum network. We investigate theoretically the quantum routing of single photons in a double-waveguide system with an infinite waveguide channel and a semi-infinite waveguide channel terminated by a perfect mirror. Numerical results show that high transfer-rate routing between two channels can be effectively performed in a wide frequency range, arising from the interferences among photons scattered by the boundary mirror and the qubits coupled to the waveguide system. This may suggest a potential scattering setup to effectively control the single-photon quantum routing. [ABSTRACT FROM AUTHOR]