Physics – Quantum Physics
Scientific paper
2010-08-31
Physics
Quantum Physics
6 pages, 4 figures
Scientific paper
Long decay times were previously observed in samples such as 29Si, C60,Y2O3 by applying multipulse nuclear magnetic resonance sequences to measure decoherence times. They are originated in stimulated echoes caused by the pulse angle distributions predictable for inhomogeneously broadened lines. In the present work, a detailed analysis describing how the stimulated echoes can be exploited as quantum coherence memories is presented. We introduce a method based on field gradients to storage coherences as polarization in a controlled way in homogeneous samples. The possibility to keep a coherent state frozen while another part of the sample is subjected to quantum operations opens new perspectives in the field of quantum information. Upon recovery of the storaged coherences, interactions among the whole system can be turned on. However, in order to perform quantum computation, the knowledge of the true coherence time is necessary. We applied the proposed method to demonstrate under the stimulated echo formalism, the appropriate experimental scheme that enables a quenching of the coherence storage, thus rendering a measurement of the coherence decay time T2.
Acosta Rodolfo H.
Franzoni Maria Belen
Levstein Patricia Rebeca
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