Super-Poissonian Squeezed Light in the Ground State of Strongly Coupled Light-matter Systems
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917159974731776 |
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| author | Tasci, Cankut Hassan, Mohammad Orlov-Sullivan, Leon Cunha, Leonardo A. Flick, Johannes |
| author_facet | Tasci, Cankut Hassan, Mohammad Orlov-Sullivan, Leon Cunha, Leonardo A. Flick, Johannes |
| contents | Strong light-matter coupling enables hybrid states in which photonic and electronic degrees of freedom become correlated even in the ground state. While many-body effects in long-range dispersion interactions are known to reshape electronic properties under such conditions, their impact on quantum-optical observables remains largely unexplored. Here, we address this problem using quantum electrodynamical density-functional theory (QEDFT) combined with the recently developed photon-many-body dispersion (pMBD) functional, which can capture higher-order electron-photon correlations and multi-photon processes. We compute ground-state photonic observables including photon number fluctuations, second-order correlations, and quadrature variances, and find squeezing and super-Poissonian photon statistics emerging from light-matter interactions in the strong coupling regime. Our results demonstrate that capturing the full hierarchy of many-body, electron-photon and multi-photon correlations is essential for a consistent description of quantum-optical properties in strongly coupled molecular systems, establishing QEDFT as a first-principles framework for predicting nonclassical photonic features in the ground state of complex systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_18242 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Super-Poissonian Squeezed Light in the Ground State of Strongly Coupled Light-matter Systems Tasci, Cankut Hassan, Mohammad Orlov-Sullivan, Leon Cunha, Leonardo A. Flick, Johannes Chemical Physics Materials Science Computational Physics Quantum Physics Strong light-matter coupling enables hybrid states in which photonic and electronic degrees of freedom become correlated even in the ground state. While many-body effects in long-range dispersion interactions are known to reshape electronic properties under such conditions, their impact on quantum-optical observables remains largely unexplored. Here, we address this problem using quantum electrodynamical density-functional theory (QEDFT) combined with the recently developed photon-many-body dispersion (pMBD) functional, which can capture higher-order electron-photon correlations and multi-photon processes. We compute ground-state photonic observables including photon number fluctuations, second-order correlations, and quadrature variances, and find squeezing and super-Poissonian photon statistics emerging from light-matter interactions in the strong coupling regime. Our results demonstrate that capturing the full hierarchy of many-body, electron-photon and multi-photon correlations is essential for a consistent description of quantum-optical properties in strongly coupled molecular systems, establishing QEDFT as a first-principles framework for predicting nonclassical photonic features in the ground state of complex systems. |
| title | Super-Poissonian Squeezed Light in the Ground State of Strongly Coupled Light-matter Systems |
| topic | Chemical Physics Materials Science Computational Physics Quantum Physics |
| url | https://arxiv.org/abs/2512.18242 |