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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.23582 |
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| _version_ | 1866911085740687360 |
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| author | Zhang, Yue-Zhi Kwek, Leong-Chuan Nie, Wei |
| author_facet | Zhang, Yue-Zhi Kwek, Leong-Chuan Nie, Wei |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23582 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hybrid Quasi-Bound State in the Continuum at Topological Quantum Optics Interface Zhang, Yue-Zhi Kwek, Leong-Chuan Nie, Wei Quantum Physics 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. |
| title | Hybrid Quasi-Bound State in the Continuum at Topological Quantum Optics Interface |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.23582 |