Direct detection of down-converted photons spontaneously produced at a single Josephson junction

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...

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Veröffentlicht in:arXiv.org 2024-05
Hauptverfasser: Fraudet, Dorian, Snyman, Izak, Basko, Denis M, Léger, Sébastien, Sépulcre, Théo, Ranadive, Arpit, Gwenael Le Gal, Torras-Coloma, Alba, Florens, Serge, Roch, Nicolas
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Sprache:eng
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Zusammenfassung: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.
ISSN:2331-8422