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The density operator describes a quantum system in an (in general mixed) state.

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We know that the Tr() is invariant with respect to unitary transformation. So does the density matrix $\rho(t)$ does not evolve with time? $\begin{align} \ \rho(t) =&|\psi(t)\rangle \langle \psi(t) …
asked May 19 by EverydayFoolish
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Consider a system S that is coupled to a bath B. Let {$|s_i\rangle 's$} and {$|b_j\rangle 's$} be the eigen states of the system and bath hamiltonians respectively (i.e) \begin{align} \hat{H}_{S}|s_i …
asked May 20 by EverydayFoolish