Does anyone of an exp operator expansion identity that for operators of the form:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

\exp \left ( \hat{A} \hat{B} \right )

[\tex]

For example, I know of the BHC decomposition:

[tex]

e^{\hat{A} + \hat{B}} = e^{-\frac{ [ \hat{A}, \hat{B} ]}{2}} e^{\hat{A}} e^{\hat{B}}

[\tex]

I've heard that there exists such an expansion for the first case but i can't find it anywhere. I'd be grateful if anyone could supply me a reference or at least point me to it.

Cheers.

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# Exp operator expansions

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