Universality in the entanglement structure of ferromagnets

Abstract

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.

arXiv comment4 pages, 2 figures

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• Connection among entanglement, mixedness and nonlocality in a dynamical context
• Thermally activated Peierls dimerization in ferromagnetic spin chains
• Entangling power of permutation invariant quantum states
• Non-Markovian entanglement dynamics between two coupled qubits in the same environment
• Entanglement Decay Versus Energy Change: A Model
• Variance squeezing and entanglement of the XX central spin model
• Entanglement harvesting in quantum superposed spacetime
• Optimal path for a quantum teleportation protocol in entangled networks
• Tri-partite non-maximally entangled mixed states as a resource for optimum controlled quantum teleportation fidelity
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• Fate of entanglement in magnetism under Lindbladian or non-Markovian dynamics and conditions for their transition to Landau-Lifshitz-Gilbert classical dynamics
• Entanglement witness and entropy uncertainty of open Quantum systems under Zeno effect
• W-like states of N uncoupled spins 1/2
• Electron-mediated entanglement of two distant macroscopic ferromagnets within a nonequilibrium spintronic device
• Qubit entanglement in multimagnon states
• Symmetry in the open-system dynamics of quantum correlations
• Decay of nonlocality due to adiabatic and quantum noise in the solid state
• Local available quantum correlations of X states: The symmetric and anti-symmetric cases