驱动超导谐振腔中的三倍周期次谐波振荡
Period-tripling subharmonic oscillations in a driven superconducting resonator
摘要：
我们在超导共面波导谐振腔$k_B T \ll \hbarω$中观察到三倍周期的亚谐波振荡。谐振器由提供克尔型非线性的可调谐电感端接。我们检测到的输出场正交的频率附近的基本模式，$ω/2π\sim 5\,$ GHz，当谐振器被驱动的电流在$3ω$的振幅超过不稳定阈值。输出辐射是从基模红失谐的。我们观察到三个稳定的辐射态，具有相等的振幅和相位移动$120^\circ$。从$3ω$到$ω$的下转换通过谐振器的第二模式的谐振激发和交叉克尔效应而强烈增强。我们的实验结果是在定量协议与两个耦合模式的驱动动力学模型。
英文摘要：
We have observed period-tripling subharmonic oscillations, in a superconducting coplanar waveguide resonator operated in the quantum regime, $k_B T \ll \hbarω$. 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, $ω/2π\sim 5\,$GHz, when the resonator was driven by a current at $3ω$ 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 $3ω$ to $ω$ 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.
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