Quantum metrology deals with improving the resolution of instruments that are otherwise limited by shot noise and it is therefore a promising avenue for enabling scientific breakthroughs. The advantage can be even more striking when quantum enhancement is combined with correlation techniques among several devices. Here, we present and realize a correlation interferometry scheme exploiting bipartite quantum correlated states injected in two independent interferometers. The scheme outperforms classical analogues in detecting a faint signal that may be correlated/uncorrelated between the two devices. We also compare its sensitivity with that obtained for a pair of two independent squeezed modes, each addressed to one interferometer, for detecting a correlated stochastic signal in the MHz frequency band. Being the simpler solution, it may eventually find application to fundamental physics tests, e.g., searching for the effects predicted by some Planck scale theories.

量子计量学致力于提高否则会受到散粒噪声限制的仪器的分辨率，因此，这是实现科学突破的有希望的途径。当量子增强与几种设备之间的相关技术结合使用时，其优势将更为显着。在这里，我们介绍并实现了一种利用两个独立干涉仪中注入的二分量子相关态的相关干涉测量方案。该方案在检测在两个设备之间可能相关/不相关的微弱信号方面优于传统的类似物。我们还将其灵敏度与一对两个独立的压缩模式（分别寻址一个干涉仪）所获得的灵敏度进行比较，以检测MHz频带中的相关随机信号。作为更简单的解决方案，