2 papers
math.FA2018
On directional derivatives of trace functionals of the form $A\mapsto\Tr(Pf(A))$
Mark W. Girard
Given a function $f:(0,\infty)\rightarrow\RR$ and a positive semidefinite matrix , one may define a trace functional on positive definite matrices as $A\…
quant-ph2017
The binegativity of two qubits
Mark W. Girard, Gilad Gour
We introduce an entanglement-related quantity that we call the binegativity. Based on numerical evidence, we conjecture that the binegativity is an entanglement measure for two-qub…