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Energy Level Crossing and Entanglement

Willi-Hans Steeb

International School for Scientific Computing, University of Johannesburg, AucklandPark 2006, South Africa

Reprint requests to W.-H. S.; E-mail: steebwilli@gmail.com

Z. Naturforsch.64a,445 – 447 (2009); receivedNovember 24, 2008 / revisedJanuary 15, 2009 We consider a Hamilton operator in a finite dimensional Hilbert space with energy level crossing.

We discuss the question how energy level crossing and entanglement of states in this Hilbert space are intertwined. Since energy level crossing is related to symmetries of the Hamilton operator we also derive these symmetries and give the reduction to the invariant Hilbert subspaces.

Key words:Energy Level Crossing; Symmetries; Group Theory; Entanglement.

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