We explore ground-state entanglement properties of helium atom confined atthe center of an impenetrable spherical cavity of varying radius by usingexplicitly correlated Hylleraas-type basis set. Results for the dependencies ofthe von Neumann and linear entanglement entropic measures on the cavity radiusare discussed in details. Some highly accurate numerical results for the vonNeumann and linear entropy are reported for the first time. It is found thatthe transition to the strong confinement regime is manifested by the entropiesas an appearance of the inflection points on their variations.
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