Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-03-16
Chem. Phys. Lett. 402 (2005) 88-95
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 3 figures, final form
Scientific paper
10.1016/j.cplett.2004.11.056
We develop the Keldysh formalism for the polarization dynamics of an open spin system. We apply it to the swapping between two qubit states in a model describing an NMR cross-polarization experiment. The environment is a set of interacting spins. For fast fluctuations in the environment, the analytical solution shows effects missed by the secular approximation of the Quantum Master Equation for the density matrix: a frequency decrease depending on the system-environment escape rate and the quantum quadratic short time behavior. Considering full memory of the bath correlations yields a progressive change of the swapping frequency.
Alvarez Gonzalo A.
Danieli Ernesto P.
Pastawski Horacio Miguel
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