Tunable Single-Photon Transport in a Multi-mode Waveguide via a $Λ$-Type Emitter

• URL: http://arxiv.org/abs/2511.22840v1
• Date: Fri, 28 Nov 2025 02:16:50 GMT
• Title: Tunable Single-Photon Transport in a Multi-mode Waveguide via a $Λ$-Type Emitter
• Authors: Yan Liu, Qing-Ao Xiang, Xin-Yuan Yang, Ji-Bing Yuan, Shi-Qing Tang, Xin-Wen Wang, Ya-Ju Song,
• Abstract summary: We investigate the manipulation of single-photon scattering via a driven $$-type emitter coupled to a rectangular waveguide.<n>In the single-mode regime, external drive parameters-the detuning and Rabi frequency-precisely tune the positions and number of reflection peaks.<n>In the multi-mode regime, quantum interference between modes governs the scattering dynamics.
• Score: 4.011006829091018
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Precise control of photon transport in waveguide quantum electrodynamics is fundamental to advancing quantum information processing. We investigate the manipulation of single-photon scattering via a driven $Λ$-type emitter coupled to a rectangular waveguide, examining both single- and multi-mode regimes. Using the Lippmann-Schwinger formalism, we derive the scattering matrix and identify two distinct control mechanisms: Fano resonances induce complete reflection, and electromagnetically induce transparency (EIT) induce perfect transmission. In the single-mode regime, the external drive parameters-the detuning and Rabi frequency-precisely tune the positions and number of reflection peaks, allowing dynamic spectral engineering. In the multi-mode regime, quantum interference between modes governs the scattering dynamics. When the input photon is prepared in a specific coherent superposition, multi-mode effects restore single-mode-like behavior, enabling Fano-mediated complete reflection. Conversely, a single-mode input prevents complete reflection even at the Fano resonance, while EIT-driven transmission persists. These results demonstrate a versatile toolbox for photonic quantum control in multi-mode waveguides, paving the way for applications such as broadband dual-frequency filters and multi-mode spectrometers.

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