Figure 16: Schematic plot of a vacuum state transformation under the action of the squeezing
operator . Eqs. (74) demonstrate the equivalence of the general squeezing operator
to a sequence of phase plane counterclockwise rotation by an angle (transition from a) to b)),
phase plane squeezing and stretching by a factor (transition from b) to c)) and rotation back
by the same angle (transition from c) to d)). Point tracks how transformations change the
initial state marked with point .
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