# Simplify the following mathematical computation?

Posted 6 months ago
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 hi . i have a code . it's processing is too hard for mathematica. becuse mathematica could not solve it after 1 hour. how i can make it easy for Processing ? (pintial is a matrix in this code) 
Sum[(t/r)^k*1/Factorial[k]*    MatrixPower[H,  k].MatrixExp[-I*H*t].MatrixExp[(-t/2*r)*MatrixPower[H, 2]].pintial.ConjugateTranspose[ MatrixPower[H,         k].MatrixExp[-I*H*t].MatrixExp[(-t/2*r)*         MatrixPower[H, 2]]], {k, 1, Infinity}]