On the basis set convergence of electron-electron entanglement measures: helium-like systems.

ABSTRACT: A systematic investigation of three different electron-electron entanglement measures, namely the von Neumann, the linear and the occupation number entropy at full configuration interaction level has been performed for the four helium-like systems hydride, helium, Li(+) and Be(2+) using a large number of different basis sets. The convergence behavior of the resulting energies and entropies revealed that the latter do in general not show the expected strictly monotonic increase upon increase of the one-electron basis. Overall, the three different entanglement measures show good agreement among each other, the largest deviations being observed for small basis sets. The data clearly demonstrates that it is important to consider the nature of the chemical system when investigating entanglement

SUBMITTER: Hofer TS 

PROVIDER: S-EPMC3982574 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature