论文标题
耦合超导谐振器中的原位可调节性非线性和竞争信号路径
In-situ tunable nonlinearity and competing signal paths in coupled superconducting resonators
论文作者
论文摘要
我们已经制造并研究了两个可调和耦合的非线性超导谐振器的系统。非线性是由循环耦合的DC平台引入的。我们通过电路模型模拟系统响应，其中包括电磁环境引入的附加信号路径。此外，我们提出了两种允许我们实验确定非线性的方法。首先，我们根据等效电路模型符合传输数据对模拟的测量频率和通量依赖性。其次，我们符合传输数据对模型的功率依赖性，该模型由描述系统的非线性运动方程式所预测。我们的结果表明，我们能够通过外部线圈和两个芯片天线来调整谐振器的非线性几乎两个数量级。研究的系统代表了较大系统的基本构建块，从而允许对具有较大晶格位点的骨骼多体系统进行量子模拟。
We have fabricated and studied a system of two tunable and coupled nonlinear superconducting resonators. The nonlinearity is introduced by galvanically coupled dc-SQUIDs. We simulate the system response by means of a circuit model, which includes an additional signal path introduced by the electromagnetic environment. Furthermore, we present two methods allowing us to experimentally determine the nonlinearity. First, we fit the measured frequency and flux dependence of the transmission data to simulations based on the equivalent circuit model. Second, we fit the power dependence of the transmission data to a model that is predicted by the nonlinear equation of motion describing the system. Our results show that we are able to tune the nonlinearity of the resonators by almost two orders of magnitude via an external coil and two on-chip antennas. The studied system represents the basic building block for larger systems, allowing for quantum simulations of bosonic many-body systems with a larger number of lattice sites.
