Entanglement Observables and Witnesses for Interacting Quantum Spin Systems
arXiv:quant-ph/0412099 · doi:10.1103/PhysRevA.72.032309
Abstract
We discuss the detection of entanglement in interacting quantum spin systems. First, thermodynamic Hamiltonian-based witnesses are computed for a general class of one-dimensional spin-1/2 models. Second, we introduce optimal bipartite entanglement observables. We show that a bipartite entanglement measure can generally be associated to a set of independent two-body spin observables whose expectation values can be used to witness entanglement. The number of necessary observables is ruled by the symmetries of the model. Illustrative examples are presented.
5 pages, 1 figure. v2: published version
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