Intermodulation spectroscopy and the nonlinear response of two-level systems in superconducting coplanar-waveguide resonators
Artikel i vetenskaplig tidskrift, 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.
Författare
Janka Biznárová
Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi
J. C. Rivera Hernández
Kungliga Tekniska Högskolan (KTH)
Daniel Forchheimer
Intermodulation Products AB
Jonas Bylander
Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi
D. Haviland
Kungliga Tekniska Högskolan (KTH)
Gustav Andersson
Pritzker School of Molecular Engineering
Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi
Physical Review Applied
2331-7019 (eISSN)
Vol. 22 1 014063Ämneskategorier
Atom- och molekylfysik och optik
Annan fysik
Den kondenserade materiens fysik
DOI
10.1103/PhysRevApplied.22.014063