Physics – Quantum Physics
Scientific paper
2006-11-07
Phys. Rev. A 76, 012309 (2007)
Physics
Quantum Physics
8 pages, 8 figures, several changes made, accepted for publication on Phys. Rev. A
Scientific paper
10.1103/PhysRevA.76.012309
Holonomic gates for quantum computation are commonly considered to be robust against certain kinds of parametric noise, the very motivation of this robustness being the geometric character of the transformation achieved in the adiabatic limit. On the other hand, the effects of decoherence are expected to become more and more relevant when the adiabatic limit is approached. Starting from the system described by Florio et al. [Phys. Rev. A 73, 022327 (2006)], here we discuss the behavior of non ideal holonomic gates at finite operational time, i.e., far before the adiabatic limit is reached. We have considered several models of parametric noise and studied the robustness of finite time gates. The obtained results suggest that the finite time gates present some effects of cancellation of the perturbations introduced by the noise which mimic the geometrical cancellation effect of standard holonomic gates. Nevertheless, a careful analysis of the results leads to the conclusion that these effects are related to a dynamical instead of geometrical feature.
Aniello Paolo
Florio Giuseppe
Lupo Cosmo
Napolitano Mario
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