How do I compute the commutator [itex][a,e^{-iHt}][/itex], knowing that [itex][H,a]=-Ea[/itex]?(adsbygoogle = window.adsbygoogle || []).push({});

I tried by Taylor expanding the exponential, but I get [itex]-iEta[/itex] to first order, which seems wrong.

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# Commutator of exponential operators

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