Experimental observation of quantum entanglement in low dimensional spin systems

Details Experimental observation of quantum entanglement in low dimensional spin systems Experimental observation of quantum entanglement in low dimensional spin systems

2006-08-17

arxiv.org/abs/cond-mat/0608403v2

Phys. Rev. B 75, 054422 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.75.054422

We report macroscopic magnetic measurements carried out in order to detect and characterize field-induced quantum entanglement in low dimensional spin systems. We analyze the pyroborate MgMnB_2O_5 and the and the warwickite MgTiOBO_3, systems with spin 5/2 and 1/2 respectively. By using the magnetic susceptibility as an entanglement witness we are able to quantify entanglement as a function of temperature and magnetic field. In addition, we experimentally distinguish for the first time a random singlet phase from a Griffiths phase. This analysis opens the possibility of a more detailed characterization of low dimensional materials.

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