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quant-ph2004★ 4 cited
A simple proof of the strong subadditivity inequality
Michael A. Nielsen, Denes Petz
Arguably the deepest fact known about the von Neumann entropy, the strong subadditivity inequality is a potent hammer in the quantum information theorist's toolkit. This short tuto…
quant-ph2001
Extending the Fisher metric to density matrices
D. Petz, Cs. Sudar
Chentsov studied Riemannian metrics on the set of probability measures from the point of view of decision theory. He proved that up to a constant factor the Fisher information is t…