论文标题
强力动力电感KERR非线性与硝酸钛纳米线
Strong kinetic-inductance Kerr nonlinearity with titanium nitride nanowires
论文作者
论文摘要
无序超导体（例如氮化钛（TIN））的薄膜表现出大型动力学电感（KI），高临界温度和单光子水平的较大质量因子。可以利用Ki非线性作为Josephson连接的替代方法，用于创建新型的非线性量子设备，并有可能在较高的频率和升高温度下运行。我们通过限制纳米线中的谐振电磁模式的当前密度来研究Ki非线性的一种方法，该密度很小，纳米线的含量很小$ v \ simeq 10^{ - 4} \ text {um}^3 $。使用此概念，我们认识到微波频率kerr腔，每光最大kerr换档为$ k/2π= 123.5 \ pm 3 $ kHz并报告非线性与线路宽度比$ k/γ= 21 \％$。随着设计的改进，我们的设备有望接近毫米波频谱中强量子非线性的状态。
Thin films of disordered superconductors such as titanium nitride (TiN) exhibit large kinetic inductance (KI), high critical temperature, and large quality factors at the single-photon level. KI nonlinearity can be exploited as an alternative to Josephson junctions for creating novel nonlinear quantum devices with the potential to operate at higher frequencies and at elevated temperatures. We study a means of magnifying KI nonlinearity by confining the current density of resonant electromagnetic modes in nanowires with a small volume $V \simeq 10^{-4}\text{um}^3$. Using this concept, we realize microwave-frequency Kerr cavities with a maximum Kerr-shift per photon of $K/2π= 123.5 \pm 3$ kHz and report a nonlinearity-to-linewidth ratio $K/γ= 21\%$. With improved design, our devices are expected to approach the regime of strong quantum nonlinearity in the millimeter-wave spectrum.
