Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917208650678272 |
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| author | Bonizzoni, Claudio Lamberto, Daniele Napoli, Samuel Gunzler, Simon Rieger, Dennis Santanni, Fabio Ghirri, Alberto Wernsdorfer, Wolfgang Savasta, Salvatore Affronte, Marco |
| author_facet | Bonizzoni, Claudio Lamberto, Daniele Napoli, Samuel Gunzler, Simon Rieger, Dennis Santanni, Fabio Ghirri, Alberto Wernsdorfer, Wolfgang Savasta, Salvatore Affronte, Marco |
| contents | We investigate Perfect Absorption (PA) of radiation, in which incoming energy is entirely dissipated, in a system consisting of molecular spin centers coherently coupled to a planar microwave resonator operated at milliKelvin temperature and in the single photon regime. This platform allows us to fine tune the spin-photon coupling and to control the effective dissipation of the two subsystems towards the environment, thus giving us the opportunity to span over a wide space of parameters. Our system can be effectively described by a non-Hermitian Hamiltonian exhibiting distinct Hermitian subspaces. We experimentally show that these subspaces, linked to the presence of PA, can be engineered through the resonator-spin detuning, which controls the composition of the polaritons in terms of photon and spin content. In such a way, the required balance between the feeding and the loss rates is effectively recovered even in the absence of PT-symmetry. We show that Hermitian subspaces influence the overall aspect of coherent spectra of cavity QED systems and enlarge the possibility to explore non-Hermitian effects in open quantum systems. We finally discuss how our results can be potentially exploited for applications, in particular as single-photon switches and modulators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05966 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces Bonizzoni, Claudio Lamberto, Daniele Napoli, Samuel Gunzler, Simon Rieger, Dennis Santanni, Fabio Ghirri, Alberto Wernsdorfer, Wolfgang Savasta, Salvatore Affronte, Marco Quantum Physics Mesoscale and Nanoscale Physics Optics We investigate Perfect Absorption (PA) of radiation, in which incoming energy is entirely dissipated, in a system consisting of molecular spin centers coherently coupled to a planar microwave resonator operated at milliKelvin temperature and in the single photon regime. This platform allows us to fine tune the spin-photon coupling and to control the effective dissipation of the two subsystems towards the environment, thus giving us the opportunity to span over a wide space of parameters. Our system can be effectively described by a non-Hermitian Hamiltonian exhibiting distinct Hermitian subspaces. We experimentally show that these subspaces, linked to the presence of PA, can be engineered through the resonator-spin detuning, which controls the composition of the polaritons in terms of photon and spin content. In such a way, the required balance between the feeding and the loss rates is effectively recovered even in the absence of PT-symmetry. We show that Hermitian subspaces influence the overall aspect of coherent spectra of cavity QED systems and enlarge the possibility to explore non-Hermitian effects in open quantum systems. We finally discuss how our results can be potentially exploited for applications, in particular as single-photon switches and modulators. |
| title | Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2505.05966 |