Abstract
We examine the entanglement in the ground states of helium and helium-like ions using an original Hylleraas expansion. The von Neumann and linear entropies of the reduced density matrix are accurately computed by performing the Schmidt decomposition of the S singlet spatial wavefunctions. The results presented are more accurate than currently available in published literature.
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Kościk, P., Okopińska, A. Entanglement Entropies in the Ground States of Helium-Like Atoms. Few-Body Syst 55, 1151–1157 (2014). https://doi.org/10.1007/s00601-014-0902-7
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DOI: https://doi.org/10.1007/s00601-014-0902-7