Phys. Rev. A 68, 032318 (2003) [8 pages]Entanglement and correlation in anisotropic quantum spin systemsReceived 17 May 2003; published 30 September 2003 Analytical expressions for the entanglement measures concurrence, i-concurrence, and 3-tangle in terms of spin correlation functions are derived using general symmetries of the quantum spin system. These relations are exploited for the one-dimensional XXZ model, in particular the concurrence and the critical temperature for disentanglement are calculated for finite systems with up to six qubits. A recent NMR quantum error correction experiment is analyzed within the framework of the proposed theoretical approach. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.032318
DOI:
10.1103/PhysRevA.68.032318
PACS:
03.67.-a, 03.65.Ud, 05.50.+q, 75.10.Jm
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