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quant-ph2026
Kubo-Ando Means and Rigidity of Quantum Positivity Cones
Mohsen Kian
We investigate the stability of quantum positivity cones under nonlinear operator means. Specifically, we examine how Kubo--Ando means interact with the separable, positive partial…
quant-ph2025
A Hierarchy of Deviation from Complete Positivity and Optimal Entanglement Witnesses
Mohsen Kian
We introduce the \emph{CP-distance} to quantify the deviation of Hermitian linear maps from complete positivity, defined as the minimal depolarizing noise required to render a map…