Quantum correlated probes for weak field sensing

冷原子量子传感器是目前最灵敏的电子能量测量装置。重力场。当代冷原子传感器通过采用量子叠加作为资源来获得它们的精度，以类似于为原子钟开发的方式，这种传感器的精度最终受到散粒噪声的限制。改进这些方法的一个令人兴奋的前景是利用量子关联，诸如NOON阶段的奇异量子态能够提高散粒噪声极限的测量精度。

Cold atom quantum sensors are at present the most sensitive devices for measuring e.e. gravitational fields. Contemporary cold atom sensors obtain their precision by employing quantum super position as a resource, in a manner similar to that developed for atomic clocks, the precision of such sensors are ultimately limited by shot noise. One exciting prospect for improving upon these methods is to utilise quantum correlations, exotic quantum states such as the NOON stage are able to ofer precision that improves upon the shot noise limit.