Multipartite entanglement and high precision metrology

  title={Multipartite entanglement and high precision metrology},
  author={G{\'e}za T{\'o}th},
  journal={Physical Review A},
  • G. Tóth
  • Published 22 June 2010
  • Physics
  • Physical Review A
We present several entanglement criteria in terms of the quantum Fisher information that help to relate various forms of multipartite entanglement to the sensitivity of phase estimation. We show that genuine multipartite entanglement is necessary to reach the maximum sensitivity in some very general metrological tasks using a two-arm linear interferometer. We also show that it is needed to reach the maximum average sensitivity in a certain combination of such metrological tasks. 

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