Quantum entanglement in multiparticle systems of two-level atoms

Details Quantum entanglement in multiparticle systems of two-level atoms Quantum entanglement in multiparticle systems of two-level atoms

2011-06-21

arxiv.org/abs/1106.4257v2

Phys. Rev. A 84, 032327 (2011)

Physics

Quantum Physics

18 pages: Typos have been corrected and some of the references have been modified. Updated to the journal version

Scientific paper

We propose the necessary and sufficient condition for the presence of quantum entanglement in arbitrary symmetric pure states of two-level atomic systems. We introduce a parameter to quantify quantum entanglement in such systems. We express the inherent quantum fluctuations of a composite system of two-level atoms as a sum of the quantum fluctuations of the individual constituent atoms and their correlation terms. This helps to separate out and study solely the quantum correlations among the atoms and obtain the criterion for the presence of entanglement in such multiatomic systems.

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