IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Time Reversal Dynamics in Scaled Dipolar Interactions by means of Continuous Radiofrequency Irradiation
Autor/es:
DENTE, A.; LISANDRO BULJUBASICH; LEVSTEIN, P.; PASTAWSKI, H. M.; CHATTAH, K.
Reunión:
Conferencia; 18th ISMAR Meeting; 2013
Resumen:
The creation of quantum computing devices requires the precise control in the evolution of quantum states. In this sense, the uncontrolled processes in many-body systems perturb coherent dynamics leading to decoherence. Thus, the understanding and the control of these uncontrolled process constitutes a challenge nowadays. In the last decades, the development of NMR techniques, allowed the study of decoherence in liquid and solid state. In this work, we combine the Loschmidt Echo with the solid state NMR technique, to study the decoherence process in scaled dipolar evolutions using as a specific model system: the polycrystalline Adamantane. In other words, we have made used the Loschmidt Echo to quantify the amount of decoherence produced by the non-controlled internal interactions, the environment and the experimental conditions.In 1970, Rhim et al. , introduced the Magic Echo pulse sequence, which enable the reversion of the secular terms in the dipolar Hamiltonian. This was, somehow, the first pulse sequence to observe the Loschmidt Echo in multi-spin dynamics. Inspired in the Magic Echo pulse sequence, we have designed new experiments having symmetric conditions, in the sense that the backward and forward evolutions require the same time. In this new pulse sequence we have been able to scale the secular terms of the dipolar evolutions in the range between 0 and 1 ⁄ 2 (the 0 value coincides with the Lee-Goldburg condition). Our experimental results are supported by detailed numerical simulations in a Hilbert space of 19-coupled spins, achieved with the aid of GPU cards.