相位滑移振荡器：少光子非线性
Phase-slip oscillator: few-photon non-linearities
摘要：
驱动振荡的非线性效应在从应用力学到光学的许多物理领域都很重要。它们是量子应用的工具。一个限制是，到目前为止已知的非线性是振荡器中光子数N的无特征函数。在这里，我们发现在振荡器中的超导电感受到相干相位滑移的非线性，是更有趣的。它们作为光子数N的函数振荡，周期为N的平方根数量级，这是相干态的扩展。我们证明，这种非线性导致在多个亚稳态包含几个光子和研究振荡依赖的各种响应的谐振器。我们的建议的实验实现可以提供一个明确的验证相干量子相位滑移。
英文摘要：
Non-linear effects on driven oscillations are important in many fields of physics, ranging from applied mechanics to optics. They are instrumental for quantum applications. A limitation is that the non-linearities known up to now are featureless functions of the number of photons N in the oscillator. Here we show that the non-linearities found in an oscillator where superconducting inductance is subject to coherent phase-slips, are more interesting. They oscillate as a function of number of photons N with a period of the order of square root of N, which is the spread of the coherent state. We prove that such non-linearities result in multiple metastable states encompassing few photons and study oscillatory dependence of various responses of the resonator. The experimental realization of our proposal can deliver an unambiguous verification of coherent quantum phase-slips.
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