Phase-coherent sensing of the center-of-mass motion of trapped-ion crystals.

@article{Affolter2020PhasecoherentSO,
  title={Phase-coherent sensing of the center-of-mass motion of trapped-ion crystals.},
  author={Matthew Affolter and Kevin A. Gilmore and J. E. Jordan and John J. Bollinger},
  journal={Physical review. A},
  year={2020},
  volume={102 5}
}
Trapped ions are sensitive detectors of weak forces and electric fields that excite ion motion. Here measurements of the center-of-mass motion of a trapped-ion crystal that are phase coherent with an applied weak external force are reported. These experiments are conducted far from the trap motional frequency on a two-dimensional trapped-ion crystal of approximately 100 ions, and determine the fundamental measurement imprecision of our protocol free from noise associated with the center-of-mass… 

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