承载Al-InAs弱连接的超导谐振器中的克尔非线性与三波混频
Kerr nonlinearity and three-wave mixing in superconducting resonators hosting Al-InAs weak links
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中文总结 AI 辅助
本文研究承载Al-InAs弱连接的超导谐振器，通过调控磁通量或栅极偏置可将克尔非线性调至零，在半导体-超导体混合器件中实验演示三波混频，验证该混合器件是可调非线性超导电路的有前景平台。
中文摘要 AI 辅助
非线性微波谐振器是量子信息处理中的多功能工具，可实现参量放大、连续变量量子计算及工程化模式相互作用。这些应用尤其受益于能实现三波混频的三次非线性；但同时，它们也受产生不良克尔效应的四次非线性限制。因此，一个反复出现的挑战是设计具有有限三次非线性同时抑制四次项的谐振器。本文中，我们研究了一个由铝帽铟砷纳米线制备的、承载两个弱连接的超导谐振器。我们将克尔非线性表征为磁通量和栅极偏置的函数，表明可通过任一控制参数将其调至零。此外，我们在一个半导体-超导体混合器件中实验演示了三波混频，证实了非零三次非线性。一个基于安德烈夫束缚态的有效模型定性地捕捉了观测到的趋势。我们的结果验证了半导体-超导体混合器件是可调谐非线性超导电路的有前景平台，可应用于参量放大、玻色模式的量子控制及微波模式间相互作用的工程化。
英文摘要
Nonlinear microwave resonators are a versatile tool in quantum information processing, enabling parametric amplification, continuous variable quantum computing, and engineered mode interactions. Many of these applications especially benefit from cubic nonlinearities enabling three-wave mixing; at the same time, they are limited by quartic nonlinearities giving rise to undesired Kerr effects. A recurrent challenge is therefore to engineer resonators with a finite cubic nonlinearity while suppressing quartic terms. Here, we investigate a superconducting resonator hosting two weak links fabricated from an aluminum-capped indium arsenide nanowire. We characterize the Kerr nonlinearity as a function of magnetic flux and gate bias, showing that it can be tuned to zero with either control parameter. Furthermore, we experimentally demonstrate three-wave mixing in a semiconductor-superconductor hybrid device, establishing nonzero cubic nonlinearity. An effective model based on Andreev bound states qualitatively captures the observed trends. Our results validate semiconductor-superconductor hybrid devices as a promising platform for tunable nonlinear superconducting circuits, with applications in parametric amplification, quantum control of bosonic modes, and engineering interactions between microwave modes.
