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Spectroscopic observation of the crossover from a classical Duffing oscillator to a Kerr parametric oscillator

We study microwave response of a Josephson parametric oscillator consisting of a superconducting transmission-line resonator with an embedded dc-SQUID. The dc-SQUID allows to control the magnitude of a Kerr nonlinearity over the ranges where it is smaller or larger than the photon loss rate. Spectroscopy measurements reveal the change of the microwave response from a classical Duffing oscillator to a Kerr parametric oscillator in a single device. In the single-photon Kerr regime, we observe parametric oscillations with a well-defined phase of either $0$ or $π$, whose probability can be controlled by an externally injected signal.

preprint2022arXivOpen access
T. YamajiS. KagamiA. YamaguchiT. SatohK. KoshinoH. GotoZ. R. LinY. NakamuraT. Yamamoto
quant-ph
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T. YamajiS. KagamiA. YamaguchiT. SatohK. KoshinoH. GotoZ. R. LinY. NakamuraT. Yamamoto

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