Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain

T Apollaro, Carlo Di Franco, F. Plastina, Mauro Paternostro

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89 Citations (Scopus)

Abstract

Using recently proposed measures for non-Markovianity [H.-P. Breuer, E. M. Laine, and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)], we study the dynamics of a qubit coupled to a spin environment via an energy-exchange mechanism. We show the existence of a point, in the parameter space of the system, where the qubit dynamics is effectively Markovian and that such a point separates two regions with completely different dynamical behaviors. Indeed, our study demonstrates that the qubit evolution can in principle be tuned from a perfectly forgetful one to a deep non-Markovian regime where the qubit is strongly affected by the dynamical backaction of the environmental spins. By means of a theoretical quantum process tomography analysis, we provide a complete and intuitive characterization of the qubit channel.
Original languageEnglish
Article number032103
Pages (from-to)032103
Number of pages1
JournalPhysical Review A
Volume83
Issue number3
DOIs
Publication statusPublished - 02 Mar 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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