Estimating Quantum Correlations in Dimerized Spin Systems Through a Correlated Mean Field Approach

J. M. MATERA; C. A. LAMAS; R. D. ROSSIGNOLI; CANOSA, N. ; A. P. BOETTE

Mar del Plata

Congreso; Quantum Optics VII; 2014

Latin American Committee for Quantum Optics

In many-body physics, the Mean Field Theory (MFT) provides an intuitive starting point for the evaluation of local observables andsome correlations. When systems develop just weak quantumcorrelations, a linear response theory built over this approximation allows us to recover many of the main features of their quantumcorrelations. However,due the fact that the approximation is based on fully factorized states, this method is not able to deal with systems which develop a large amount of entanglement among its components. In this contribution we shallemploy a Correlated Mean Field scheme to study quantumcorrelations for the case of systems which presents strong but localized quantumcorrelations. Applications to the estimation of pairwise, bipartite and multipartiteentanglement in the zig-zag ladders and other dimerized chains are discussed. Besides, analytical results from both a linear response theory and a perturbative approach over this correlated mean field state arepresented, as well as their comparison with numerical results.