参量下转换光子磁学中的海森堡极限
Towards Heisenberg Limit in Magnetometry with Parametric Down Converted Photons
摘要：
最近的理论和实验论文表明，如何可以实现海森堡有限的测量使用纠缠光子。在这里，我们展示了如何在非共线的下转换过程中的光子可以用于提高磁光旋转的灵敏度的四个因素，使我们对海森堡极限。我们的结果适用于任意泵浦源。我们还提出了几个推广的共线几何的早期结果。灵敏度取决于是否使用双光子或四光子符合探测。
英文摘要：
Recent theoretical and experimental papers have shown how one can achieve Heisenberg limited measurements by using entangled photons. Here we show how the photons in non-collinear down conversion process can be used for improving the sensitivity of magneto-optical rotation by a factor of four which takes us towards the Heisenberg limit. Our results apply to sources with arbitrary pumping. We also present several generalizations of earlier results for the collinear geometry. The sensitivity depends on whether the two-photon or four-photon coincidence detection is used.
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