Entanglement and correlation in anisotropic quantum spin systems
- 30 September 2003
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 68 (3)
- https://doi.org/10.1103/physreva.68.032318
Abstract
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.Keywords
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