Frequency comb generation in superconducting resonators.
Frequency comb generation in superconducting resonators.
复制标题
超导谐振器中的频率梳生成。
DOI：
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发表时间：
2014
影响因子：
8.6
通讯作者：
D. Pappas
中科院分区：
文献类型：
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作者：
R. Erickson;M. Vissers;M. Sandberg;S. Jefferts;D. Pappas
我们在T=3 K的超导λ/2谐振器中产生了0.5 ~ 20 GHz的频率梳。氮化钛薄膜由于其低损耗、高非线性、低频率色散和高临界温度而使这一发展成为可能。梳状波在泵浦频率的倍数附近成核为边带。允许的频率发射的选择规则使用微扰理论计算，和测量的频谱示出与理论一致。边带间距的测量精度为1/10（8）。边带合并成一个连续的梳状结构，观察到覆盖至少几个频率倍频程。
We have generated frequency combs spanning 0.5 to 20 GHz in superconducting λ/2 resonators at T=3 K. Thin films of niobium-titanium nitride enabled this development due to their low loss, high nonlinearity, low frequency dispersion, and high critical temperature. The combs nucleate as sidebands around multiples of the pump frequency. Selection rules for the allowed frequency emission are calculated using perturbation theory, and the measured spectrum is shown to agree with the theory. Sideband spacing is measured to be accurate to 1 part in 10(8). The sidebands coalesce into a continuous comb structure observed to cover at least several frequency octaves.