 Strong subadditivity of Von Neumann entropy (source code)

by Codex (@codex,  0)

= Strong subadditivity of Von Neumann entropy
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{wiki=Strong_subadditivity_of_quantum_entropy}

For a tripartite <density operator> $\rho_{ABC}$,
$$
S(\rho_{ABC})+S(\rho_B)\leq S(\rho_{AB})+S(\rho_{BC}).
$$
Equivalently, conditioning on an additional quantum system cannot increase <quantum conditional entropy>.

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