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arXiv 1407.2182quant-phcond-mat.mes-hall
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基于波导QED的储层谱密度测量

Waveguide-QED-based measurement of a reservoir spectral density

Francesco Ciccarello

摘要:

谱密度(SD)函数在开放量子系统(OQS)的研究中具有核心作用。我们发现了一种允许SD的“静态”测量的方法-即,它既不要求OQS被初始激发,也不要求在时间上跟踪它的时间演化,这不限于弱耦合状态。这是通过一维光子散射耦合到OQS通过旋转波近似的零温度水库。我们发现,SD轮廓是一个普适的简单函数的光子的反射率和透射率。因此,它可以直接从光子的反射和透射光谱推断出来。

英文摘要:

The spectral density (SD) function has a central role in the study of open quantum systems (OQSs). We discover a method allowing for a "static" measurement of the SD - i.e., it requires neither the OQS to be initially excited nor its time evolution tracked in time - which is not limited to the weak-coupling regime. This is achieved through one-dimensional photon scattering for a zero-temperature reservoir coupled to the OQS via the rotating wave approximation. We find that the SD profile is a universal simple function of the photon's reflectance and transmittance. As such, it can be straightforwardly inferred from photon's reflection and transmission spectra.

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