Reconstructing Josephson Current-Phase Relations with Intermodulation Spectroscopy

ORAL

Abstract


When driving with multiple tones, a nonlinear system will give rise to intermodulation, or frequency mixing. Two drive tones placed near a nonlinear resonance produces a comb of intermodulation products. We present a method based on matrix inversion to reconstruct the nonlinearity from a measurement of this comb [1, 2]. We apply this method to a microwave frequency comb generated from a Nb-coplanar waveguide resonator with Josephson weak-links. This method is useful for accurate characterization of nonlinearities in superconducting quantum circuits.

[1] Hutter et al., PRL 104, 050801 (2010)
[2] Platz et. al., Beilstein J. Nanotechnol., 4, 352–360 (2013)

*The authors acknowledge financial support from Knut and Alice Wallenberg Foundation.

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Presenters

  • Shan Jolin

    • Applied Physics, KTH Royal Institute of Technology
    • Nanostructure Physics, KTH Royal Institute of Technology

Authors

  • Shan Jolin

    • Applied Physics, KTH Royal Institute of Technology
    • Nanostructure Physics, KTH Royal Institute of Technology

  • Thomas Weißl

    • Nanostructure Physics, KTH Royal Institute of Technology

  • Riccardo Borgani

    • Applied Physics, KTH Royal Institute of Technology
    • Royal Institute of Technology
    • Nanostructure Physics, KTH Royal Institute of Technology

  • David Haviland

    • Applied Physics, KTH Royal Institute of Technology
    • Royal Institute of Technology
    • Nanostructure Physics, KTH Royal Institute of Technology