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Jan 25, 2023 at 18:21 history edited Keith Rush CC BY-SA 4.0
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Jan 25, 2023 at 18:16 history edited Keith Rush CC BY-SA 4.0
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Feb 21, 2022 at 21:58 history edited Keith Rush CC BY-SA 4.0
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Jan 12, 2022 at 2:53 comment added Nathaniel Johnston The sum of the entries of $\phi(v)$ is called the "quantum fidelity" of $A$ and $\mathrm{diag}(v)$. That quantity is known to be concave in each of its entries, so perhaps something useful can be obtained there.
Jan 12, 2022 at 1:17 history asked Keith Rush CC BY-SA 4.0