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For questions about geometrical features of the set of quantum states.

11 votes
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Is the set of all states with negative conditional Von Neumann entropy convex?

The conditional von Neumann entropy is a concave function: if $\rho$ and $\sigma$ are states of a pair of registers $(\mathsf{X},\mathsf{Y})$ and $\lambda\in[0,1]$ is a real number, then $$ \mathrm{H} …
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