https://doi.org/10.1140/epjd/e2013-40080-y
Regular Article
Entanglement in helium
1
CNISM and Center for Nonlinear and Complex Systems, Università
degli Studi dell’Insubria, Via
Valleggio 11, 22100
Como,
Italy
2
Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Via
Celoria 16, 20133
Milano,
Italy
3
Department of Information Technologies, University of
Milan, Via Bramante
65, 26013
Crema,
Italy
4
Department of Physics, University of Milan,
Via Celoria 16, 20133
Milano,
Italy
a e-mail: giuliano.benenti@uninsubria.it
Received:
12
September
2012
Received in final form:
12
February
2013
Published online:
30
April
2013
Using a configuration-interaction variational method, we accurately compute the reduced, single-electron von Neumann and linear entropy for several low-energy, singlet and triplet eigenstates of helium atom. We estimate the amount of electron-electron orbital entanglement for such eigenstates and show that it decays with energy.
Key words: Quantum Information
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013