Abstract
We present a new approach for studying theoretical model of a parametric amplifier. We show that time-evolution of parametric amplifier can be treated as formalism of angular momentum system by using the newly found bosonic operator realization of three generators (J +, J −, J z ). The entangled state representation is essential in this approach. The transition probability from vacuum state to two-mode squeezed state in a parametric amplifier can be directly evaluated.
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