Direct detection of down-converted photons spontaneously produced at a single Josephson junction
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929697809498112 |
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| author | Fraudet, Dorian Snyman, Izak Basko, Denis M. Léger, Sébastien Sépulcre, Théo Ranadive, Arpit Gal, Gwenael Le Torras-Coloma, Alba Florens, Serge Roch, Nicolas |
| author_facet | Fraudet, Dorian Snyman, Izak Basko, Denis M. Léger, Sébastien Sépulcre, Théo Ranadive, Arpit Gal, Gwenael Le Torras-Coloma, Alba Florens, Serge Roch, Nicolas |
| contents | We study spontaneous photon decay into multiple photons triggered by strong non-linearities in a superconducting quantum simulator of the boundary sine-Gordon impurity model. Previously, spectroscopic signatures of photon-conversion were reported and evidenced as resonances in the many-body spectrum of these systems. Here, we report on the observation of multi-mode fluorescence of a small Josephson junction embedded in a high impedance superconducting transmission line. Measurement of the down-converted photons is achieved using state-of-the-art broadband parametric amplifiers. Photon triplet emission is explicitly demonstrated at a given frequency as the counterpart of inelastic photon decay at three-times the emission frequency. These results open exciting prospects for the burgeoning field of many-body quantum optics and offer a direct signature of the ultra-strong light-matter coupling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_00411 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct detection of down-converted photons spontaneously produced at a single Josephson junction Fraudet, Dorian Snyman, Izak Basko, Denis M. Léger, Sébastien Sépulcre, Théo Ranadive, Arpit Gal, Gwenael Le Torras-Coloma, Alba Florens, Serge Roch, Nicolas Mesoscale and Nanoscale Physics Quantum Physics We study spontaneous photon decay into multiple photons triggered by strong non-linearities in a superconducting quantum simulator of the boundary sine-Gordon impurity model. Previously, spectroscopic signatures of photon-conversion were reported and evidenced as resonances in the many-body spectrum of these systems. Here, we report on the observation of multi-mode fluorescence of a small Josephson junction embedded in a high impedance superconducting transmission line. Measurement of the down-converted photons is achieved using state-of-the-art broadband parametric amplifiers. Photon triplet emission is explicitly demonstrated at a given frequency as the counterpart of inelastic photon decay at three-times the emission frequency. These results open exciting prospects for the burgeoning field of many-body quantum optics and offer a direct signature of the ultra-strong light-matter coupling. |
| title | Direct detection of down-converted photons spontaneously produced at a single Josephson junction |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2405.00411 |