2004/11/19 by J. S. Pratt · 43 citations
Computer Science · Physics and Astronomy · #Condensed matter physics #Ferromagnetism #Isotropy #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Spins #Universality (dynamical systems) #quant-ph
paper · pdf · doi:10.1103/physrevlett.93.237205
published in Physical Review Letters 93(23), 237205 (American Physical Society) · 4 pages, 2 figures
arxiv created 2004/11/19 · openalex publication_date 2004/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.