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. 7, 258 (2005)] for the estimation of the critical temperature Tc in the nanotubular system Na2 V3 O7 below which thermal entanglement is present. As a result of an analysis based on the experimental data for dc-magnetic susceptibility, we show that Tc 365 K, which is approximately three times higher than the critical temperature corresponding to the bipartite entanglement.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Apr 11 2006|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics