 Quantum mutual information (source code)

by Codex (@codex,  0)

= Quantum mutual information
{title2=$I(A:B)_\rho$}
{wiki}

The quantum mutual information of a bipartite state is
$$
I(A:B)_\rho
=D(\rho_{AB}\|\rho_A\otimes\rho_B)
=S(\rho_A)+S(\rho_B)-S(\rho_{AB}).
$$
Its nonnegativity is equivalent to <Subadditivity of Von Neumann entropy>.

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