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Journal of Physics B Atomic Molecular and Optical Physics

Single-photon routing in a multi- T -shaped waveguide

J. C. Huang, Jingwen Wang, Yao Wang, Zhonghui Xu, Yangwan Zhong

Published Nov 23, 2018• 7 citations
Publisher

Abstract

Abstract We investigate quantum routing in a multi- T -shaped waveguide coupled to driven cyclic three-level systems. Exact expressions of the scattering coefficients for the double- T and triple- T waveguides are obtained by employing the discrete-coordinate scattering and the transfer matrix approach, respectively. Our results show that high transfer-rate routing of single photons from the input infinite channel to the other channels can be effectively implemented in the extended multi- T configuration, in contrast with the single- T waveguide with the transfer of no more than 0.5. The proposed router may be utilized as a scalable quantum device to control single-photon routing.

DOI
10.1088/1361-6455/aaf344

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Abstract We investigate quantum routing in a multi- T -shaped waveguide coupled to driven cyclic three-level systems. Exact expressions of the scattering coefficients for the double- T and triple- T waveguides are obtained by employing the discrete-coordinate scattering and the transfer matrix approach, respectively. Our results show that high transfer-rate routing of single photons from the input infinite channel to the other channels can be effectively implemented in the extended multi- T configuration, in contrast with the single- T waveguide with the transfer of no more than 0.5. The proposed router may be utilized as a scalable quantum device to control single-photon routing.
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We propose a new model of a T-shaped quantum router composed of two InGaAs quantum dots and two coupled-cavity waveguides, where the quantum dots are embedded in an infinite coupled-cavity waveguide that serves as an incoming route, with one of the dots being placed at the junction. Based on the discrete scattering equations, we theoretically discuss the controllable transport behavior of a single photon in a hybrid system with one input and two outputs. The results show that the reflection, transmission, and transfer rates can be successfully adjusted by various parameters such as the transition energy of the quantum dots, the momentum of the incident photons, the coupling strength between the quantum dots and the waveguides, and detuning. The validity and control of the reflection, transmission, and transfer rates of the single photons in the T-shaped quantum router make it possible to design various quantum devices.
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 a T -shaped single-photon router constructed by two waveguides connected via a giant Λ-type three-level atom. Under a real-space approach, the analytical expressions of the single-photon transmission and reflection amplitudes are obtained. It is shown that a high transfer-rate routing between two waveguides can be effectively achieved by modulating the phase difference, the accumulated phase and the atom-waveguide coupling strengths, and its frequencies can be tuned with a classical driving field. Interestingly, chiral scattering and a single-photon targeted router with direction selectivity have been realized by the ideally equivalent atom-waveguide interaction. We believe that our results have potential applications in constructing optical quantum devices and designing the single-photon quantum routing using the giant-atom setup.
We have investigated the single-photon transport property in a T-shaped coupled-resonant waveguide (CRW), which consists of an infinite CRW and a semi-infinite CRW, coupled to a cascaded three-level emitter. A c-mode cavity field is introduced to drive the one transition of the cascaded three-level system. Two cases that a single photon is incident from the infinite CRW and semi-infinite CRW are considered, respectively. We obtain the transmission, reflection and transfer amplitudes analytically and our results show that the transmission, reflection and transfer rates can be controlled by adjusting the detuning and coupling strengths between the c-mode cavity field and one transition of the three-level system. Our study provides a full quantum control scheme of single-photon transport properties in a T-shaped waveguide.