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Michael Trott
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You can also try this:[mcode]\[Rho]M[t_] = Table[\[Rho][i, j][t], {i, 2}, {j, 2}] H = PauliMatrix[1] sol1 = DSolve[{I \[HBar] \[Rho]M'[t] == H.\[Rho]M[t] - \[Rho]M[t].H, \[Rho]M[0] == Table[\[Rho]0[i, j], {i, 2}, {j, 2}]},...