离散经典分量场的量子噪声功率谱
Quantum-Noise Power Spectrum of Fields with Discrete Classical Components
摘要：
本文提出了一种计算具有任意离散经典谱的光场在相干态或压缩态下产生的光电流的量子噪声谱密度的算法。测量方案可以包括光电流的任意数量的解调。因此，我们的方法是适用于在许多实验中实现的一般外差检测方案。对于其中的一些实验，例如在激光干涉引力波探测器中，相干态和压缩态场的量子噪声的可靠预测在设计阶段和探测器表征中起着决定性的作用。尽管如此，我们的调查在两个方面受到限制。首先，我们只考虑场的相干态和压缩态，其次，我们要求光电流线性依赖于场的真空振幅，这意味着至少有一个经典分量是比较强的。
英文摘要：
We present an algorithmic approach to calculate the quantum-noise spectral density of photocurrents generated by optical fields with arbitrary discrete classical spectrum in coherent or squeezed states. The measurement scheme may include an arbitrary number of demodulations of the photocurrent. Thereby, our method is applicable to the general heterodyne detection scheme which is implemented in many experiments. For some of these experiments, e.g. in laser-interferometric gravitational-wave detectors, a reliable prediction of the quantum noise of fields in coherent and squeezed states plays a decisive role in the design phase and detector characterization. Still, our investigation is limited in two ways. First, we only consider coherent and squeezed states of the field and second, we demand that the photocurrent depends linearly on the field's vacuum amplitudes which means that at least one of the classical components is comparatively strong.
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