Feasible phase detection with ideal sensitivity
Giacomo Mauro D’Ariano, Chiara Macchiavello, Matteo G. A. Paris · Journal of Physics A Mathematical and General · 1996
We present a first feasible scheme for detecting the phase of a single mode of radiation with ideal RMS sensitivity versus the average number of photons . It involves pairs of alternate independent homodyne measurements of two conjugated quadratures on a weakly squeezed state at the input. Nonunit quantum efficiency of photodetectors degrades phase sensitivity leading to a power law , with increasing versus .