Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-01-23
Phys. Rev. A 75, 062116 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures, title changed, some typos changed
Scientific paper
10.1103/PhysRevA.75.062116
An environment interacting with portions of a system leads to multiexponential interaction rates. Within the Keldysh formalism, we fictitiously homogenize the system-environment interaction yielding a uniform decay rate facilitating the evaluation of the propagators. Through an injection procedure we neutralize the fictitious interactions. This technique justifies a stroboscopic representation of the system-environment interaction which is useful for numerical implementation and converges to the natural continuous process. We apply this procedure to a fermionic two-level system and use the Jordan-Wigner transformation to solve a two-spin swapping gate in the presence of a spin environment.
Alvarez Gonzalo A.
Danieli Ernesto P.
Levstein Patricia Rebeca
Pastawski Horacio Miguel
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