arXiv 1703.044252017-03quant-phcond-mat.supr-con

约瑟夫森参量变换器饱和与高阶效应

Josephson parametric converter saturation and higher order effects

G. Liu, T. -C. Chien, X. Cao, O. Lanes, E. Alpern, D. Pekker, M. Hatridge

备注：: 5 pages, 4 figures
DOI：: 10.1063/1.5003032

摘要：

基于约瑟夫森结的微波参量放大器已成为许多量子信息实验的关键部件。理论上尚未很好预测的一个关键限制是决定其处理大幅度信号的能力的增益饱和行为。对基于三波混频的相位保持放大器中的这种行为的典型解释是泵浦耗尽，其中产生放大的泵浦光子的消耗导致增益的降低。然而，在这项工作中，我们提出的实验数据和理论计算表明，四阶克尔非线性固有的约瑟夫森结的约瑟夫森参量转换器（JPC）的主导因素。基于克尔的理论有一个不寻常的性质，即根据偏置条件，导致较低和较高增益的饱和。这项工作提出了一种新的方法，优化器件性能的克尔非线性的存在，同时保留设备的可调谐性，并指出控制高阶哈密顿项的必要性，使参数器件的进一步改进。

英文摘要：

Microwave parametric amplifiers based on Josephson junctions have become a key component of many quantum information experiments. One key limitation which has not been well predicted by theory is the gain saturation behavior which determines its ability to process large amplitude signals. The typical explanation for this behavior in phase-preserving amplifiers based on three-wave mixing is pump depletion, in which the consumption of pump photons to produce amplification results in a reduction in gain. However, in this work we present experimental data and theoretical calculations showing that the fourth-order Kerr nonlinearities inherent in the Josephson junctions are the dominant factor in the Josephson Parametric Converter (JPC). The Kerr-based theory has the unusual property of causing saturation to both lower and higher gains, depending on bias conditions. This work presents a new methodology for optimizing device performance in the presence of Kerr nonlinearities while retaining device tunability, and points to the necessity of controlling higher-order Hamiltonian terms to make further improvements in parametric devices.

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