Rotation sensing at the ultimate limit

Abstract Conventional classical sensors are approaching their maximum sensitivity levels in many areas. Yet these still far from the ultimate limits dictated by quantum mechanics. Quantum promise a substantial step ahead taking advantage of salient states to environment. Here, we focus on sensing rotations, topic broad application. By resorting basic tools estimation theory, derive that achieve sensitivities estimating both orientation an unknown rotation axis and angle rotated about it. The critical enhancement obtained with optimal should make them indispensable ingredient next generation is now blossoming.