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Probing a two-level system bath via the frequency shift of an off-resonantly-driven cavity

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arxiv 1805.04397 v5 pith:2SSOYHC7 submitted 2018-05-11 quant-ph cond-mat.mes-hall

Probing a two-level system bath via the frequency shift of an off-resonantly-driven cavity

Thibault Capelle , Emmanuel Flurin , Edouard Ivanov , Jose Palomo , Michael Rosticher , Sheon Chua , Tristan Briant , Pierre-Fran\c{c}ois Cohadon
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Antoine Heidmann Thibaut Jacqmin Samuel Deleglise
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classification quant-ph cond-mat.mes-hall
keywords bathcavityfrequencyheremodelresonatorsshiftsystem
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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 a cavity in the presence of an off-resonant pump has yet to be fully understood. Here a semi-classical model that predicts a power-dependent frequency shift besides the well-known TLS-induced damping is derived. 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 characterize various properties of the TLS bath, such as their average dephasing rate.

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