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A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description.

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Operator acting on product of coherent states

Similarly to the answer you linked we can rewrite the state as $\vert \psi\rangle=\exp\left(-\frac{1}{2}\sum_k \vert\alpha'_k\vert^2\right)\exp\left(\sum_k \alpha'_k a^\dagger_k\right)\vert 0\rangle$. …
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