Nondegenerate parametric oscillations in a tunable superconducting resonator
Artikel i vetenskaplig tidskrift, 2018

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 s how 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.


Andreas Bengtsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Philip Krantz

Massachusetts Institute of Technology (MIT)

Michael Roger Andre Simoen

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Ida-Maria Svensson


Ben Schneider


Vitaly Shumeiko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Per Delsing


Jonas Bylander


Physical Review B

2469-9950 (ISSN) 2469-9969 (eISSN)

Vol. 97 14 144502


Annan fysik

Fusion, plasma och rymdfysik

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