Quantum-enhanced sensing of a single-ion mechanical oscillator

@article{McCormick2019QuantumenhancedSO,
  title={Quantum-enhanced sensing of a single-ion mechanical oscillator},
  author={K. McCormick and J. Keller and S. Burd and D. Wineland and Andrew C. Wilson and D. Leibfried},
  journal={Nature},
  year={2019},
  pages={1-5}
}
Special quantum states are used in metrology to achieve sensitivities below the limits established by classically behaving states1,2. In bosonic interferometers, squeezed states3, number states4,5 and ‘Schrödinger cat’ states5 have been implemented on various platforms and have demonstrated improved measurement precision over interferometers using coherent states6,7. Another metrologically useful state is an equal superposition of two eigenstates with maximally different energies; this state… Expand
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