Furman G.B.,Ben - Gurion University of the Negev |
Furman G.B.,College Ohalo |
Meerovich V.M.,Ben - Gurion University of the Negev |
Sokolovsky V.L.,Ben - Gurion University of the Negev
International Journal of Quantum Information | Year: 2013
A dipolar coupled spin system can achieve internal thermodynamic equilibrium states at negative absolute temperature. We study analytically and numerically the temperature dependence of the concurrence in a dipolar coupled spin-1/2 system in both nonzero and zero fields and show that, at negative temperatures, entangled states can exist even in zero magnetic field. © 2013 World Scientific Publishing Company.