We show how to reach high fidelity NOON states with a high count rate inside optical interferometers. Previously, it has been shown that by mixing squeezed and coherent light at a beam splitter, it is possible to generate NOON states of arbitrary N with a fidelity as high as 94%. The scheme is based on higher-order interference between “quantum” down-converted light and “classical” coherent light. However, this requires optimizing the amplitude ratio of classical to quantum light, thereby limiting the overall count rate for the interferometric super-resolution signal. We propose using coherent beam stimulated noncollinear two-mode down-converted light as input to the interferometer. Our scheme is based on the stimulation of noncollinear parametric down conversion by coherent light sources. We get a better flexibility of choosing the amplitude ratio in generating NOON states. This enables super-resolution intensity exceeding the previous scheme by many orders of magnitude. Therefore, we hope to improve the magnitude of N-fold super-resolution in quantum interferometry for arbitrary N using bright light sources. We give improved results for N = 4 and 5.

中文翻译：

---

使用相干光束激励的非共线参量下变换，获得具有高光子通量的高正弦态

我们展示了如何在光学干涉仪内部以高计数率达到高保真NOON状态。先前已经表明，通过在分束器处混合压缩和相干的光，可以生成任意N的NOON状态。保真度高达94％。该方案基于“量子”下变频光和“经典”相干光之间的高阶干涉。但是，这需要优化经典光与量子光的振幅比，从而限制了干涉式超分辨率信号的总体计数率。我们建议使用相干光束激发的非共线双模下转换光作为干涉仪的输入。我们的方案基于相干光源对非共线参数下变频的刺激。在产生NOON状态时，我们可以更好地选择振幅比。这使得超分辨率强度比以前的方案高出多个数量级。因此，我们希望提高N的幅度使用明亮光源对任意N进行量子干涉测量时的1倍超分辨率。对于N  = 4和5，我们给出了改进的结果。