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We characterize supramolecular magnetic structures, consisting of two weakly coupled antiferromagnetic rings, by low-temperature specific heat, susceptibility, magnetization and electron paramagnetic resonance measurements. Intra-and inter-ring interactions are modeled through a microscopic spin-Hamiltonian approach that reproduces all the experimental data quantitatively and legitimates the use of an effective two-qubit picture. Spin entanglement between the rings is experimentally demonstrated through magnetic susceptibility below 50 mK and theoretically quantified by the concurrence.
American Physical Society
Publication date: 
21 Jan 2010

A Candini, G Lorusso, F Troiani, A Ghirri, S Carretta, P Santini, G Amoretti, C Muryn, F Tuna, G Timco, EJL McInnes, Richard EP Winpenny, Wolfgang Wernsdorfer, Marco Affronte

Biblio References: 
Volume: 104 Issue: 3 Pages: 037203
Physical review letters