Generation of the Schrödinger-cat state by continuous photodetection
Tetsuo Ogawa, Masahito Ueda, Nobuyuki Imoto · Physical Review A · 1991
Nonunitary time evolution of an initially highly squeezed state under continuous photon-number measurement is investigated using the quasiprobability distribution. It is found that the measured quantum state bifurcates into two macroscopically distinguishable states upon the detection of a single photon, while preserving purity by feeding back real-time readout information.