Entanglement and correlation in anisotropic quantum spin systems

Details Entanglement and correlation in anisotropic quantum spin systems Entanglement and correlation in anisotropic quantum spin systems

2003-05-20

arxiv.org/abs/quant-ph/0305108v1

Phys. Rev. A 68, 032318 (2003)

Physics

Quantum Physics

8 pages, 3 figures

Scientific paper

10.1103/PhysRevA.68.032318

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.

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