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## Homework Statement

It is not a problem, But I am doing a coursework on Quantum Optics on my own. The following derivation is for P-function in Quantum optics from the book Quantum Optics by Marlan O.Scully and M. Suhail Zubairy. I attached the Image of the derivation with this Question.

## Homework Equations

Relevant Equations are given in the Image

## The Attempt at a Solution

I expanded the trace in the (3.1.11) in |α> basis. But I am unable to get (3.1.13).