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Quantum Information Processing

Efficient single-photon routing in a double-waveguide system with a mirror

J. C. Huang, Ji-Tai Zhong, Yanling Li, Zhonghui Xu, Qingsheng Xiao

Published Aug 24, 2020• 10 citations
Publisher
DOI
10.1007/s11128-020-02789-0

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We propose a quantum routing scheme based on coupled-cavity waveguides incorporating a three-level quantum dot with classical-field-driven cyclic transitions and an additional two-level quantum dot acting as an atomic-like mirror. In contrast to conventional single-emitter or simple multi-emitter configurations, where the photon transfer rate is typically limited to 0.5, the proposed system introduces an additional interference pathway via the auxiliary quantum dot, enabling enhanced routing controllability. By employing discrete scattering theory, we analytically derive the transmission, reflection, and inter-waveguide transfer coefficients and systematically investigate their dependence on the Rabi frequency, emitter–waveguide coupling strength, detuning, and incident direction. The results show that the interplay between dressed-state formation and multi-channel interference significantly modifies the spectral response of the system. In particular, the transfer rate into the secondary waveguide can exceed 0.5 under appropriate conditions, demonstrating a clear advantage over previously reported schemes. These findings provide a physically transparent mechanism for achieving flexible and efficient single-photon routing and offer theoretical guidance for the design of integrated quantum photonic devices, such as quantum routers, beam splitters, and on-chip quantum network components.
Abstract We investigate single-photon quantum routing composed of double two-level atoms coupled to two infinite waveguides. By introducing local coupling phases at atom-waveguide connecting points, we engineer asymmetric atom-waveguide interactions, which enables the directional control of photon propagation for achieving high-efficiency quantum routing. Using the real-space approach, we derived exact expressions of the single-photon scattering amplitudes, allowing for a comprehensive analysis of the routing dynamics. For both identical and non-identical atomic configurations, we systematically explored the conditions for achieving perfect photon transfer. Our results demonstrate that complete photon transfer can be realized by precisely tuning the coupling phases, the accumulated phase and atomic frequencies. This work provides a theoretical foundation for developing high-efficiency quantum routers with potential applications in quantum networks and photonic quantum information processing.