Most Subradiant Bound Photon Pairs from Chirality-Mediated Dispersion Softening
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910277336825856 |
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| author | Tan, Kailin Jiang, Xuanbing Wang, Dong Wu, Saijun |
| author_facet | Tan, Kailin Jiang, Xuanbing Wang, Dong Wu, Saijun |
| contents | We study the subradiant bound states (BSs) in a two-level atom array chirally coupled to a one-dimensional waveguide. We demonstrate that the chiral interaction can drive BSs to become the most subradiant two-excitation states across a wide spacing range. This phenomenon is rooted in a mechanism of chirality-mediated dispersion softening, where the BS band distortion suppresses the band curvature $|α_2|$ at an extremum point. We rigorously prove that the BS decay rate follows the scaling $Γ\sim |α_2|/N^3$, revealing that the reduction of $|α_2|$ is key to suppressing emission and enhancing subradiance. We also show the existence of chiral BSs in a realistic nanofiber interface. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2606_01146 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Most Subradiant Bound Photon Pairs from Chirality-Mediated Dispersion Softening Tan, Kailin Jiang, Xuanbing Wang, Dong Wu, Saijun Quantum Physics Atomic Physics We study the subradiant bound states (BSs) in a two-level atom array chirally coupled to a one-dimensional waveguide. We demonstrate that the chiral interaction can drive BSs to become the most subradiant two-excitation states across a wide spacing range. This phenomenon is rooted in a mechanism of chirality-mediated dispersion softening, where the BS band distortion suppresses the band curvature $|α_2|$ at an extremum point. We rigorously prove that the BS decay rate follows the scaling $Γ\sim |α_2|/N^3$, revealing that the reduction of $|α_2|$ is key to suppressing emission and enhancing subradiance. We also show the existence of chiral BSs in a realistic nanofiber interface. |
| title | Most Subradiant Bound Photon Pairs from Chirality-Mediated Dispersion Softening |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2606.01146 |