Acoustic spectral hole-burning in a two-level system ensemble
Journal article, 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 acoustic pumping can be used to enhance the coherence of superconducting devices by saturating TLSs.

Surface Acoustic wave



Gustav Andersson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

A. L. O. Bilobran

Polytechnic University of Valencia (UPV)

Marco Scigliuzzo

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

M. M. de Lima

Polytechnic University of Valencia (UPV)

J. H. Cole

RMIT University

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

npj Quantum Information

20566387 (eISSN)

Vol. 7 1 15

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics



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