Physics – Quantum Physics
Scientific paper
2000-09-04
Physics Letters A, vol. 280, nos. 5-6, pp. 282-288 (2001)
Physics
Quantum Physics
RevTeX, 11 page single-spaced preprint, no figures. Version two has new title, abstract, introduction & conclusions, while the
Scientific paper
10.1016/S0375-9601(01)00083-4
An extension of the product operator formalism of NMR is introduced, which uses the Hadamard matrix product to describe many simple spin 1/2 relaxation processes. The utility of this formalism is illustrated by deriving NMR gradient-diffusion experiments to simulate several decoherence models of interest in quantum information processing, along with their Lindblad and Kraus representations. Gradient-diffusion experiments are also described for several more complex forms of decoherence, including the well-known collective isotropic model. Finally, it is shown that the Hadamard formalism gives a concise representation of decoherence with arbitrary correlations among the fluctuating fields at the different spins involved, and that this can be applied to both decoherence (T2) as well as nonadiabatic relaxation (T1) processes.
Cory David G.
Havel Timothy F.
Sharf Yehuda
Viola Lorenza
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