• Corpus ID: 91183899

Sensor self-interaction, scale-invariant spin dynamics, and the $\hbar$ limit of field sensing

@article{Mitchell2019SensorSS,
  title={Sensor self-interaction, scale-invariant spin dynamics, and the \$\hbar\$ limit of field sensing},
  author={Morgan W. Mitchell},
  journal={arXiv: Quantum Physics},
  year={2019}
}
  • M. Mitchell
  • Published 2 April 2019
  • Physics
  • arXiv: Quantum Physics
We describe quantum limits to field sensing that relate noise, geometry and measurement duration to fundamental constants, with no reference to particle number. We cast the Tesche and Clarke (TC) bound on dc-SQUID sensitivity as such a limit, and find analogous limits for volumetric spin-precession magnetometers, e.g. alkali vapors and nitrogen-vacancy centers in diamond. The volumetric limits arise from scale-invariance of the sensors' internal dynamics, through which particle number… 

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