Large-amplitude coherent-state superposition generated by a time-separated two-photon subtraction from a continuous-wave squeezed vacuum

Masahiro Takeoka, Hiroki Takahashi, Masahide Sasaki
2008 Physical Review A. Atomic, Molecular, and Optical Physics  
Theoretical analysis is given for a two-photon subtraction from a continuous wave (CW) squeezed vacuum with finite time separation between two detection events. In the CW photon subtraction process, the generated states are inevitably described by temporal mutimode states. Our approach is based on Schrödinger picture which provides mathematically simple forms and an intuitive understanding of its multimode structure. We show that, in our process, the photon subtracted squeezed vacuum is
more » ... d in two temporal modes and one of these modes acts as an ancillary mode to make the other one a large amplitude coherent state superposition.
doi:10.1103/physreva.77.062315 fatcat:doivkiq2zfdrvo6fjmqhboywaa