Uhlmann fidelity: $\max_U |\langle\phi^\rho| U_R \otimes I_A |\phi^\sigma\rangle|^2$ over canonical purifications

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Uhlmann fidelity: $\max_U |\langle\phi^\rho| U_R \otimes I_A |\phi^\sigma\rangle|^2$ over canonical purifications · Prove2Me