The Phase Sensitivity of the Coincidence Detection in one Output Port of a Mach-Zehnder Interferometer
Harim Shin, Henoh Kim, Goo-Dong Park, Taesoo Kim · Journal of the Optical Society of Korea · 2005
The phase sensitivity of the coincidence detection in one output port of a Mach-Zehnder interferometer is analysed for twin Fock state inputs. Firstly, the ideal detectors with quantum efficiency of unity are assumed for the detection of the output photons. The sensitivity is found out to be independent of the photon number of input light, which means that the Heisenberg limit cannot be reached in the coincidence detection even with ideal detectors. Secondly, the practical detectors with quantum efficiencies less than unity are discussed.