Rotation sensing at the ultimate limit

@article{ZGoldberg2021RotationSA,
  title={Rotation sensing at the ultimate limit},
  author={Aaron Z Goldberg and Andrei B Klimov and Gerd Leuchs and Luis L S{\'a}nchez-Soto},
  journal={Journal of Physics: Photonics},
  year={2021},
  volume={3}
}
Conventional classical sensors are approaching their maximum sensitivity levels in many areas. Yet these levels are still far from the ultimate limits dictated by quantum mechanics. Quantum sensors promise a substantial step ahead by taking advantage of the salient sensitivity of quantum states to the environment. Here, we focus on sensing rotations, a topic of broad application. By resorting to the basic tools of estimation theory, we derive states that achieve the ultimate sensitivities in… 
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