Detecting Large Quantum Fisher Information with Finite Measurement Precision.

@article{Frwis2016DetectingLQ,
  title={Detecting Large Quantum Fisher Information with Finite Measurement Precision.},
  author={Florian Fr{\"o}wis and Pavel Sekatski and Wolfgang D{\"u}r},
  journal={Physical review letters},
  year={2016},
  volume={116 9},
  pages={
          090801
        }
}
We propose an experimentally accessible scheme to determine the lower bounds on the quantum Fisher information (QFI), which ascertains multipartite entanglement or usefulness for quantum metrology. The scheme is based on comparing the measurement statistics of a state before and after a small unitary rotation. We argue that, in general, the limited resolution of collective observables prevents the detection of large QFI. This can be overcome by performing an additional operation prior to the… Expand
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