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arXiv 1801.04566quant-phcond-mat.supr-con
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可调谐超导谐振器中的非简并参量振荡

Nondegenerate parametric oscillations in a tunable superconducting resonator

Andreas Bengtsson, Philip Krantz, Michaël Simoen, Ida-Maria Svensson, Ben Schneider, Vitaly Shumeiko, Per Delsing, Jonas Bylander

摘要:

本文研究了超导量子干涉器端接的多模超导微波谐振腔中的非简并参量振荡。通过以接近两个谐振器模式频率之和的频率调制通过SQUID的磁通量来实现参数效应。对于超过不稳定阈值的调制幅度,在这两种模式中观察到自持振荡。这些振荡的振幅显示出良好的定量协议与理论模型。振荡相位被发现是相关的,并表现出强烈的波动,拓宽了振荡谱线宽度。这些线宽显着减少,通过施加一个弱的谐振音,这也抑制了相位波动。当弱音失谐时,我们观察到振荡频率与输入频率的同步。对于失谐输入,我们还观察到三个空闲出现在输出。这一观察结果与相干输入的四模放大和压缩理论相一致。

英文摘要:

We investigate nondegenerate parametric oscillations in a multimode superconducting microwave resonator that is terminated by a 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-resonance 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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