Thermal entanglement in the nanotubular system Na_2V_3O_7

Details Thermal entanglement in the nanotubular system Na_2V_3O_7 Thermal entanglement in the nanotubular system Na_2V_3O_7

2005-03-31

arxiv.org/abs/cond-mat/0503726v2

Phys. Rev. B 73, 134404 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 figures, REVTeX4

Scientific paper

10.1103/PhysRevB.73.134404

Macroscopic entanglement witnesses have been put forward recently to reveal nonlocal quantum correlations between individual constituents of the solid at nonzero temperatures. Here we apply a recently proposed universal entanglement witness, the magnetic susceptibility [New J. Phys. {\bf 7}, 258 (2005)] for the estimation of the critical temperature $T_c$ in the nanotubular system ${\rm Na_2V_3O_7}$ below which thermal entanglement is present. As a result of an analysis based on the experimental data for dc-magnetic susceptibility, we show that $T_c \approx 365$ K, which is approximately three times higher than the critical temperature corresponding to the bipartite entanglement.

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