利用人工单原子连续波混频探测相干态的统计特性
Probing the statistics of coherent states by continuous wave mixing on a single artificial atom
摘要：
研究了超导人工原子上连续相干波的四阶及高阶混频。观察和研究了原子与多光子弹性散射产生的不同阶非线性窄边峰。我们推导出峰值振幅的解析表达式，并表明，任何两个相邻的峰的比例是一个函数的驱动振幅和失谐。这归因于相干态中的光子分布，并为非经典相干波中的光子统计特性提供了一种度量。我们还证明了一个Autler-Townes分裂的侧峰，其规模与散射顺序的大小。
英文摘要：
We study four- and higher-order wave mixing of continuous coherent waves on a single superconducting artificial atom. Narrow side peaks of different orders of nonlinearity resulting from elastic multi-photon scattering on the atom are observed and investigated. We derive an analytical expression for the peak amplitudes and show that the ratio of any two adjacent peaks is a function of driving amplitudes and detuning. This is attributed to the photon distribution in the coherent states and provides a measure for characterisation of photon statistics in non-classical coherent waves. We also demonstrate an Autler-Townes-like splitting of side peaks, the magnitude of which scales with the scattering order.
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