Noh-Fougères-Mandel operational phase operator as an entangling operator and the corresponding squeezed state
Hong-Yi Fan, Zhihu Sun · Journal of Physics A Mathematical and General · 2001
We construct a new number-difference and operational phase entangled state by operating the Noh-Fougères-Mandel (NFM) phase operator on the two-mode twin-photon state. Its Schmidt decomposition is derived by virtue of the previously constructed Einstein-Podolsky-Rosen eigenstate. We reach the conclusion that the NFM phase operator is essentially an entangling operator, based on which a new type of number-difference and operational phase squeezed state can be introduced.