2005/03/31 by M. Wiesniak, V. Vedral, C. Brukner · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1088/1367-2630/7/1/258
published as New Journal of Physics 7, 258 (2005) · 6 Pages, 2 figures, revtex4
arxiv created 2006/02/13 · arxiv updated 2009/12/01
We show that magnetic susceptibility can reveal spin entanglement between individual constituents of a solid, while magnetisation describes their local properties. We then show that these two thermodynamical quantities satisfy complementary relation in the quantum-mechanical sense. It describes sharing of (quantum) information in the solid between spin entanglement and local properties of its individual constituents. Magnetic susceptibility is shown to be a macroscopic spin entanglement witness that can be applied without complete knowledge of the specific model (Hamiltonian) of the solid.