Universality in the entanglement structure of ferromagnets

Details Universality in the entanglement structure of ferromagnets Universality in the entanglement structure of ferromagnets

2004-11-17

arxiv.org/abs/quant-ph/0411125v2

Phys. Rev. Lett. 93, 237205 (2004)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.93.237205

Systems of exchange-coupled spins are commonly used to model ferromagnets. The quantum correlations in such magnets are studied using tools from quantum information theory. Isotropic ferromagnets are shown to possess a universal low-temperature density matrix which precludes entanglement between spins, and the mechanism of entanglement cancellation is investigated, revealing a core of states resistant to pairwise entanglement cancellation. Numerical studies of one-, two-, and three-dimensional lattices as well as irregular geometries showed no entanglement in ferromagnets at any temperature or magnetic field strength.

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