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Article overview
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Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain | T. J. G. Apollaro
; C. Di Franco
; F. Plastina
; M. Paternostro
; | Date: |
25 Nov 2010 | Abstract: | Using recently proposed measures for non-Markovianity [H. P. Breuer, E. M.
Laine, and J. Piilo, Phys. Rev. Lett. {f 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 back-action of the environmental spins. By
means of quantum process tomography, we provide a complete and intuitive
characterization of the qubit channel. | Source: | arXiv, 1011.5653 | Services: | Forum | Review | PDF | Favorites |
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