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Entanglement Observables and Witnesses for Interacting Quantum Spin Systems | | L.-A. Wu
; S. Bandyopadhyay
; M.S. Sarandy
; D.A. Lidar
; | | Date: |
13 Dec 2004 | | Journal: | Phys. Rev. A 72, 032309 (2005) | | Subject: | Quantum Physics; Statistical Mechanics; Strongly Correlated Electrons | quant-ph cond-mat.stat-mech cond-mat.str-el | | Affiliation: | Center for Quantum Information and Quantum Control, University of Toronto | | 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. | | Source: | arXiv, quant-ph/0412099 | | Other source: | [GID 1042421] quant-ph/0412099 | | Services: | Forum | Review | PDF | Favorites | |
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