Time dependent perturbation theory for density matrix

paweld
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Does anyone kown how to apply time dependent perturbation theory to densities
matricies (I'm interested in first order)?
Thanks.
 
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Yes I know I am late, but for future reference. The idea is to use the Louisville's equation in the interaction picture ( can be found in wiki in interaction picture). Then you transform the equation into a integral equation and substitute it again in the Louisville's equation. Repeat the process for higher orders. I hope this helps.
 

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