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 __   _    _    _    _    _      ___      _  __  
| || | || | || | || | \  / ||   / _ \\   | |/ // 
| '--' || | || | || |  \/  ||  / //\ \\  | ' //  
| .--. || | \\_/ || | .  . || |  ___  || | . \\  
|_|| |_||  \____//  |_|\/|_|| |_||  |_|| |_|\_\\ 
`-`  `-`    `---`   `-`  `-`  `-`   `-`  `-` --`

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Text this: Statistical methods in quantum optics 2 : non-classical fields