1208.5459 (M. S. Reis et al.)

Evidence for entanglement at high temperatures in an engineered
molecular magnet    [PDF]

M. S. Reis, S. Soriano, A. M. dos Santos, B. C. Sales, D. O. Soares-Pinto, P. Brandao

The molecular compound [Fe$_{2}$($\mu_{2}$-oxo)(C$_{3}$H$_{4}$N$_{2}$)$_{6}$(C$_{2}$O$_{4}$)$_{2}$] was designed and synthesized for the first time and its structure determined using single crystal x-ray diffraction. The magnetic susceptibility of this compound was measured from 2 to 300 K. Analysis of the susceptibility data using protocols developed for other spin singlet ground state systems indicates the existence of entangled quantum states up to temperatures as high as 732 K, the highest entanglement temperature reported to date. The large gap between the ground state and the first excited state (282 K) suggests that the spin system may be somewhat immune to decohering mechanisms. Our measurements strongly suggest that molecular magnets are promising candidate platforms for quantum information processing.

View original: http://arxiv.org/abs/1208.5459