J. Phys. I France 6 (1996) 783-791
Intraenvironmental Correlations in the Ground State of a Nonisolated Two-State ParticleE. Paladino, G. Benivegna and A. Messina
INFM, Istituto di Fisica dell'Università degli Studi di Palermo, Gruppo Nazionale del CNR and Centro Universitario del MURST Via Archirafi 36, 90123 Palermo, Italy
(Received 12 December 1995, revised 6 February 1996, accepted 29 February 1996)
The existence of entanglement in the ground state of a two-level particle coupled to a bosonic environment is proved. The quantum covariances of pairs of simple dynamical variables relative to different subsystems are explicitly shown to be bounded. Physically interpretable conditions for the occurrence of weak intraenvironmental correlations are reported and discussed. The potentialities of our treatment are briefly put into evidence.
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