Global estimation of phase using double homodyne detection and single photons
Mihai D. Vidrighin, Magdalena Szczykulska, Brian J. Smith, Ian A. Walmsley · 2017
A double homodyne measurement implements phase estimation for arbitrary phase values, without prior information, optimising precision for path-symmetric probe states with defined photon number. We demonstrated the method’s precision and accuracy experimentally, using single-photon probes.