Optimal states and almost optimal adaptive measurements for quantum interferometry

  title={Optimal states and almost optimal adaptive measurements for quantum interferometry},
  author={Berry and Wiseman},
  journal={Physical review letters},
  volume={85 24},
We derive the optimal N-photon two-mode input state for obtaining an estimate straight phi of the phase difference between two arms of an interferometer. For an optimal measurement [B. C. Sanders and G. J. Milburn, Phys. Rev. Lett. 75, 2944 (1995)], it yields a variance (Deltastraight phi)(2) approximately pi(2)/N2, compared to O(N-1) or O(N-1/2) for states considered by previous authors. Such a measurement cannot be realized by counting photons in the interferometer outputs. However, we… CONTINUE READING
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