Practical quantum metrology with large precision gains in the low photon number regime

  title={Practical quantum metrology with large precision gains in the low photon number regime},
  author={Paul A. Knott and Timothy J. Proctor and A. J. Hayes and J. P. Cooling and Jacob A Dunningham},
  journal={Physical Review A},
Quantum metrology exploits quantum correlations to make precise measurements with limited particle numbers. By utilizing inter- and intra- mode correlations in an optical interferometer, we find a state that combines entanglement and squeezing to give a 7-fold enhancement in the quantum Fisher information (QFI) - a metric related to the precision - over the shot noise limit, for low photon numbers. Motivated by practicality we then look at the squeezed cat-state, which has recently been made… 

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