ISSN:
1434-6079
Keywords:
PACS. 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) – 03.67.Lx Quantum computation – 75.10.Jm Quantized spin models
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: For pairs of particles extracted from a symmetric state of N two-level systems, the two-particle density matrix is expressed in terms of expectation values of collective spin operators for the large system. Results are presented for experimentally relevant examples of pure states: Dicke states | S, M〉, spin coherent, and spin squeezed states, where only the symmetric subspace, S = N/2 is populated, and for thermally entangled mixed states populating also lower S values. The entanglement of the extracted pair is then quantified by a calculation of the concurrence, which provides directly the entanglement of formation of the pair.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjd/e20020045
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