Holevo bound chi = S(rho-bar) - sum p_i S(rho_i) >= I_acc; concavity on convex hull

Layer 1 — Physicsin the quantum-information-physics subtree

Holevo-Schumacher-Westmoreland (HSW) accessible-information framework (Holevo 1973 Probl Inf Trans 9, 177; Schumacher-Westmoreland 1997 PR A 56, 131; Hausladen-Jozsa-Schumacher-Westmoreland-Wootters 1996 PR A 54, 1869). Setup: classical…

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