Nonlinear Charge- and Flux-Tunable Cavity Derived From an Embedded Cooper-Pair Transistor

Nonlinear Charge- and Flux-Tunable Cavity Derived From an Embedded Cooper-Pair Transistor
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来自嵌入式库珀对晶体管的非线性电荷和磁通可调腔

DOI:
10.1103/physrevapplied.15.044009
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发表时间:
2021
影响因子:
4.6
通讯作者:
Rimberg, A.J.
Rimberg, A.J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brock, B.L.;Li, Juliang;Kanhirathingal, S.;Thyagarajan, B.;Braasch, William F.;Blencowe, M.P.;Rimberg, A.J.

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我们介绍了一种腔内铜对晶体管(cCPT),它是一种表现为高度非线性微波腔的器件,其谐振频率可以通过对栅极电容器充电和通过超导环路穿线来调谐。我们对这种装置进行了表征,发现理论与实验非常吻合。这种表征的一个关键困难是存在与腔线宽相当的频率波动,这使我们测量的共振圆变形,与最近的理论预测一致[Brocket al., Phys.]。应用学报,14,054026 (2020)[j]。通过在参数空间中精心选择的点上测量这些频率波动的功率谱密度,我们发现它们主要是固态器件中常见的电荷和通量噪声的结果。值得注意的是,我们还通过Kerr非线性观察到腔场中量子涨落引起的频率波动的关键特征。
We introduce the cavity-embedded Cooper-pair transistor (cCPT), a device that behaves as a highly nonlinear microwave cavity whose resonant frequency can be tuned both by charging a gate capacitor and by threading flux through a superconducting loop. We characterize this device and find excellent agreement between theory and experiment. A key difficulty in this characterization is the presence of frequency fluctuations comparable in scale to the cavity linewidth, which deform our measured resonance circles in accordance with recent theoretical predictions [Brocket al., Phys. Rev. Appl. 14, 054026 (2020)]. By measuring the power spectral density of these frequency fluctuations at carefully chosen points in parameter space, we find that they are primarily a result of thecharge and flux noise common in solid-state devices. Notably, we also observe key signatures of frequency fluctuations induced by quantum fluctuations in the cavity field via the Kerr nonlinearity.
DOI: --
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期刊:
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DOI: 10.1103/physrevb.90.020506
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期刊: PHYSICAL REVIEW B
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作者:
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