1. Period-tripling subharmonic oscillations in a driven superconducting resonator
- Author
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Vitaly Shumeiko, Philip Krantz, Andreas Bengtsson, Jonas Bylander, Per Delsing, and Ida-Maria Svensson
- Subjects
Kerr effect ,superconducting devices ,FOS: Physical sciences ,02 engineering and technology ,SQUID ,01 natural sciences ,Omega ,Instability ,Resonator ,Condensed Matter::Superconductivity ,nonlinear superconducting resonators ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,0103 physical sciences ,010306 general physics ,Nonlinear Sciences::Pattern Formation and Solitons ,Superconductivity ,Physics ,Quantum Physics ,Condensed Matter - Mesoscale and Nanoscale Physics ,Coplanar waveguide ,Condensed Matter Physics ,021001 nanoscience & nanotechnology ,subharmonic oscillations ,Amplitude ,tunable resonators ,Nano Technology ,Atomic physics ,Quantum Physics (quant-ph) ,0210 nano-technology ,Excitation - Abstract
We have observed period-tripling subharmonic oscillations, in a superconducting coplanar waveguide resonator operated in the quantum regime, $k_B T \ll \hbar\omega$. The resonator is terminated by a tunable inductance that provides a Kerr-type nonlinearity. We detected the output field quadratures at frequencies near the fundamental mode, $\omega/2\pi \sim 5\,$GHz, when the resonator was driven by a current at $3\omega$ with an amplitude exceeding an instability threshold. The output radiation was red-detuned from the fundamental mode. We observed three stable radiative states with equal amplitudes and phase-shifted by $120^\circ$. The downconversion from $3\omega$ to $\omega$ is strongly enhanced by resonant excitation of the second mode of the resonator, and the cross-Kerr effect. Our experimental results are in quantitative agreement with a model for the driven dynamics of two coupled modes.
- Published
- 2017