Monday, August 13, 2012

1208.2131 (Gian Luca Giorgi et al.)

Decoherence-assisted transport and quantum criticalities    [PDF]

Gian Luca Giorgi, Thomas Busch
We study the dynamics of a two-level quantum system interacting with an external environment that takes the form of an XY spin chain in the presence of an external magnetic field. While the presence of the bath itself can enhance the transition probability from the lower level to the upper level of the system, we show that this noise-assisted phenomenon is sensitive to a change of the quantum phase of the environment. The derivative of the transition probability displays a maximum in correspondence with the critical value of the applied field both in the case of isotropic and anisotropic chains.
View original: http://arxiv.org/abs/1208.2131

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