Hybrid Quasi-Bound State in the Continuum at Topological Quantum Optics Interface

• URL: http://arxiv.org/abs/2507.23582v1
• Date: Thu, 31 Jul 2025 14:15:48 GMT
• Title: Hybrid Quasi-Bound State in the Continuum at Topological Quantum Optics Interface
• Authors: Yue-Zhi Zhang, Leong-Chuan Kwek, Wei Nie,
• Abstract summary: We show that a topological atom array can induce photon localization in a waveguide via symmetry-protected light-matter interaction.<n>Long-lived photon-atom entanglement reveals the existence of a novel topological quasi-bound state in the continuum (quasi-BIC)<n>Our work demonstrates an unconventional quasi-BIC at a topological quantum optics interface with potential applications in quantum devices.
• Score: 1.05961607616747
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Topological manipulation of light provides a versatile toolbox for photonic technologies. Here, we show that a topological atom array can induce photon localization in a waveguide via symmetry-protected light-matter interaction. Long-lived photon-atom entanglement reveals the existence of a novel topological quasi-bound state in the continuum (quasi-BIC). This hybrid light-matter quasi-BIC is formed at a critical coupling condition via collectively induced absorption, which is produced by quantum interference between edge and bulk states. We uncover the time-reversed relation between topological quasi-BIC and light amplification. Interestingly, one can realize a directional ultranarrow amplifier by means of critical coupling. Our work demonstrates an unconventional quasi-BIC at a topological quantum optics interface with potential applications in quantum devices.

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