Efficiencies of quantum optical detectors

@article{Hogg2014EfficienciesOQ,
  title={Efficiencies of quantum optical detectors},
  author={D. Hogg and Dominic W. Berry and A. I. Lvovsky},
  journal={Physical Review A},
  year={2014},
  volume={90},
  pages={053846}
}
We propose a definition for the efficiency that can be universally applied to all classes of quantum optical detectors. This definition is based on the maximum amount of optical loss that a physically plausible device can experience while still replicating the properties of a given detector. We prove that detector efficiency cannot be increased using linear optical processing. That is, given a set of detectors, as well as arbitrary linear optical elements and ancillary light sources, it is… 

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