Ultrastrong Coupling Signatures in Photon Statistics from Terahertz Higgs-Polaritons
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866911638780641280 |
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| author | Talkington, Spenser Kass, Benjamin Claassen, Martin |
| author_facet | Talkington, Spenser Kass, Benjamin Claassen, Martin |
| contents | The ultrastrong coupling regime of cavity photons and quantum materials has emerged as a pathway to modify materials properties, however definitive signatures of ultrastrong coupling remain elusive. Focusing on the quantum photon statistics of light transmitted through a cavity-embedded superconductor, we show that a two-photon Higgs polariton at strong coupling realizes a photonic nonlinearity at the single terahertz photon level. We find that as light-matter coupling increases, the photon statistics show pronounced changes due to the formation of a hybrid photon-matter dark-cavity state with finite photon occupancy, producing testable signatures of ultrastrong coupling. We derive a non-Markovian input output relation and study the cavity-embedded superconductor 2H-NbSe2 as it approaches ultrastrong light-matter coupling. Our results reveal a diagnostic for ultrastrong coupling in the two-photon coincidence statistics that is absent in total counts. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_15417 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrastrong Coupling Signatures in Photon Statistics from Terahertz Higgs-Polaritons Talkington, Spenser Kass, Benjamin Claassen, Martin Strongly Correlated Electrons Superconductivity Optics Quantum Physics The ultrastrong coupling regime of cavity photons and quantum materials has emerged as a pathway to modify materials properties, however definitive signatures of ultrastrong coupling remain elusive. Focusing on the quantum photon statistics of light transmitted through a cavity-embedded superconductor, we show that a two-photon Higgs polariton at strong coupling realizes a photonic nonlinearity at the single terahertz photon level. We find that as light-matter coupling increases, the photon statistics show pronounced changes due to the formation of a hybrid photon-matter dark-cavity state with finite photon occupancy, producing testable signatures of ultrastrong coupling. We derive a non-Markovian input output relation and study the cavity-embedded superconductor 2H-NbSe2 as it approaches ultrastrong light-matter coupling. Our results reveal a diagnostic for ultrastrong coupling in the two-photon coincidence statistics that is absent in total counts. |
| title | Ultrastrong Coupling Signatures in Photon Statistics from Terahertz Higgs-Polaritons |
| topic | Strongly Correlated Electrons Superconductivity Optics Quantum Physics |
| url | https://arxiv.org/abs/2604.15417 |