Rényi-2 entanglement of purification of the symmetric Werner state

Abstract

This paper determines exactly the Rényi-2 entanglement of purification of the normalized symmetric Werner state in every local dimension $d\ge2$ \begin{equation*} \mathrm{EoP}_2(W_{+,d})=\log_2\frac{4d(d+1)}{d^2+3d+4}. \end{equation*} We establish additivity for tensor power and, more generally, additivity for finite products of symmetric Werner states with different local dimensions. A canonical purification and its products achieve these values globally, even when arbitrary joint purifications with unrestricted finite dimensional auxiliary systems are allowed. We further examine perturbations away from the symmetric endpoint, and prove the continuity of the optimal value at this endpoint; moreover, we show a sharp square root order of variation in the optimal purity, while the canonical purification remains asymptotically optimal in the achieved entropy as this weight goes to zero.