TITLE:
Tunable Single-Photon Nonreciprocal Transmission and Directional Routing in a Microresonator-Waveguide System with Multiple Coupling Points
AUTHORS:
Jinsong Huang, Le Zhang, Hongwu Huang
KEYWORDS:
Quantum Nonreciprocity, Quantum Routing, Scattering Theory, Optical Waveguide, Microresonator
JOURNAL NAME:
Journal of Modern Physics,
Vol.17 No.2,
February
12,
2026
ABSTRACT: We investigate the controllable single-photon transport via a microresonator coupled to two meandering waveguides at multiple coupling points. Using the analytical expressions of the single-photon scattering amplitudes obtained by the real-space Hamiltonian, the transport characteristics in the waveguide system are demonstrated. These results show that the perfectly nonreciprocal transmission in a single waveguide and the directional routing approaching the unity probability in two waveguides can be achieved by adjusting the resonator-waveguide coupling related to the phase parameter, arising from the phase-dependent interference effect of the multiple point couplings of the resonator. Our proposal may have wide potentials in quantum information processing.