Acoustic spectral hole-burning in a two-level system ensemble
G Andersson, ALO Bilobran, M Scigliuzzo, MM de Lima, JH Cole, P Delsing
NPJ QUANTUM INFORMATION | NATURE RESEARCH | Published : 2021
Microscopic two-level system (TLS) defects at dielectric surfaces and interfaces are among the dominant sources of loss in superconducting quantum circuits, and their properties have been extensively probed using superconducting resonators and qubits. We report on spectroscopy of TLSs coupling to the strain field in a surface acoustic wave (SAW) resonator. The narrow free spectral range of the resonator allows for two-tone spectroscopy where a strong pump is applied at one resonance, while a weak signal is used to probe a different mode. We map the spectral hole burnt by the pump tone as a function of frequency and extract parameters of the TLS ensemble. Our results suggest that detuned acou..View full abstract
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Awarded by European Union
Awarded by Australian Research Council Centre of Excellence programme
This work was supported by the Swedish Research Council, VR and by the Knut and Alice Wallenberg foundation. This project has also received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 642688 (SAWtrain). JHC is supported by the Australian Research Council Centre of Excellence programme through Grant number CE170100026 and the Australian National Computational Infrastructure facility.