Intermodulation spectroscopy and the nonlinear response of two-level systems in superconducting coplanar-waveguide resonators
Journal article, 2024
Two-level system (TLS) loss typically limits the coherence of superconducting quantum circuits. The loss induced by TLS defects is nonlinear, resulting in quality factors with a strong dependence on the circulating microwave power. We observe frequency mixing due to this nonlinearity by applying a two-tone drive to a coplanar waveguide resonator and measuring the intermodulation products using a multifrequency lock-in technique. This intermodulation spectroscopy method provides an efficient approach to characterizing TLS loss in superconducting circuits. Using harmonic balance reconstruction, we recover the nonlinear parameters of the device-TLS interaction, which are in good agreement with the standard tunneling model for TLSs.
Author
Janka Biznárová
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
J. C. Rivera Hernández
Royal Institute of Technology (KTH)
Daniel Forchheimer
Intermodulation Products AB
Jonas Bylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
D. Haviland
Royal Institute of Technology (KTH)
Gustav Andersson
Pritzker School of Molecular Engineering
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Physical Review Applied
2331-7019 (eISSN)
Vol. 22 1 014063Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevApplied.22.014063