Intermodulation spectroscopy and the nonlinear response of two-level systems in superconducting coplanar waveguide resonators

• URL: http://arxiv.org/abs/2402.10775v1
• Date: Fri, 16 Feb 2024 15:57:57 GMT
• Title: Intermodulation spectroscopy and the nonlinear response of two-level systems in superconducting coplanar waveguide resonators
• Authors: Janka Bizn\'arov\'a, J. C. Rivera Hern\'andez, Daniel Forchheimer, Jonas Bylander, David B. Haviland, Gustav Andersson
• Abstract summary: Two-level system (TLS) loss is limiting the coherence of superconducting quantum circuits. We observe frequency mixing due to this nonlinearity by applying a two-tone drive to a coplanar waveguide resonator. Using harmonic balance reconstruction, we recover the nonlinear parameters of the device-TLS interaction.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Two-level system (TLS) loss is typically limiting 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 tunnelling model for TLSs.

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