Nondegenerate parametric oscillations in a tunable superconducting resonator

Andreas Bengtsson, Philip Krantz, Michaël Simoen, Ida-Maria Svensson, Ben Schneider, Vitaly Shumeiko, Per Delsing, and Jonas Bylander
Phys. Rev. B 97, 144502 – Published 4 April 2018

Abstract

We investigate nondegenerate parametric oscillations in a superconducting microwave multimode resonator that is terminated by a superconducting quantum interference device (SQUID). The parametric effect is achieved by modulating magnetic flux through the SQUID at a frequency close to the sum of two resonator-mode frequencies. For modulation amplitudes exceeding an instability threshold, self-sustained oscillations are observed in both modes. The amplitudes of these oscillations show good quantitative agreement with a theoretical model. The oscillation phases are found to be correlated and exhibit strong fluctuations which broaden the oscillation spectral linewidths. These linewidths are significantly reduced by applying a weak on-resonant tone, which also suppresses the phase fluctuations. When the weak tone is detuned, we observe synchronization of the oscillation frequency with the frequency of the input. For the detuned input, we also observe an emergence of three idlers in the output. This observation is in agreement with theory indicating four-mode amplification and squeezing of a coherent input.

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  • Received 14 January 2018

DOI:https://doi.org/10.1103/PhysRevB.97.144502

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nonlinear DynamicsQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Andreas Bengtsson1,*, Philip Krantz2, Michaël Simoen1, Ida-Maria Svensson1, Ben Schneider1, Vitaly Shumeiko1, Per Delsing1, and Jonas Bylander1

  • 1Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96, Göteborg, Sweden
  • 2Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • *andreas.bengtsson@chalmers.se

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Vol. 97, Iss. 14 — 1 April 2018

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