Probing a Two-Level System Bath via the Frequency Shift of an Off-Resonantly Driven Cavity
| Autor: | Emmanuel Flurin, Pierre-François Cohadon, José Palomo, Thibaut Jacqmin, Edouard Ivanov, M. Rosticher, Sheon Chua, Tristan Briant, Thibault Capelle, Samuel Deléglise, Antoine Heidmann |
|---|---|
| Přispěvatelé: | Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Coupling Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Dephasing FOS: Physical sciences General Physics and Astronomy Semiclassical physics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Resonator Planar [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Saturation (chemistry) Spectroscopy Microwave ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review Applied Physical Review Applied, American Physical Society, 2020, 13 (3), ⟨10.1103/PhysRevApplied.13.034022⟩ |
| ISSN: | 2331-7019 |
| Popis: | Although the main loss channel of planar microwave superconducting resonators has been identified to be related to an external coupling to a two-level system (TLS) bath, the behavior of such resonators in the presence of an off-resonant pump has yet to be fully understood. Alongside the well-known power-dependent damping, we observe a frequency shift with a conspicuous maximum for intermediate pump power that is attributed to a spectrally asymmetric saturation of the TLSs. We derive a semiclassical model that describes both of these effects quantitatively. The model is validated experimentally by performing a two-tone spectroscopy of several resonators fabricated on various substrates. Together with the provided analytic formulas, the technique proposed here is a simple yet powerful tool to unambiguously identify the presence of a limiting TLS bath, and to characterize various properties thereof, such as its average dephasing rate. |
| Databáze: | OpenAIRE |
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