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We study a system of two Coulombically interacting electrons in an externalharmonic potential in the presence of an on-centre Coulomb impurity. Detailedresults for the dependencies of the reduced von Neumann entropy on the controlparameters of the system are provided for both the ground state and the tripletS states with the lowest energy. Among other features, it is found that in theweak confinement regime the entanglement is strongly affected by the presenceof an acceptor impurity.

Entanglement in S states of two-electron quantum dots with Coulomb impurities at the center