Conditional generation scheme for entangled vacuum evacuated coherent states by mixing two coherent beams with a squeezed vacuum state

Conditions to generate high-purity entangled vacuum-evacuated coherent states (|0>|α>0−|−α>0|0>) were studied for two cascade-placed beam splitters, with one squeezed state input and two coherent state inputs whenever a single photon is detected. Controlling the amplitudes and the phases of the beams allows for various amplitudes of the vacuum-evacuated coherent states (|α>0=|α>−e−|α|2|0>) up to α=2.160 to be manipulated with high-purity.