Reduced visibility of quantum oscillations in the spin-boson model

Details Reduced visibility of quantum oscillations in the spin-boson model Reduced visibility of quantum oscillations in the spin-boson model

2005-07-22

arxiv.org/abs/cond-mat/0507526v2

New Journal of Physics 10 (2008) 115011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 2 figures; significant update

Scientific paper

The loss of coherence of quantum oscillations is of fundamental interest as well as of practical importance in quantum computing. In solid-state experiments the oscillations show, next to the familiar exponential decay on time scales $T_{1/2}$, an overall loss of amplitude. We solve the spin-Boson for a large class of initial conditions without the Markov approximation at the pure dephasing point. It is shown that a loss of visibility occurs in the form of a fast initial drop for factorized initial conditions and an overall reduction for entangled initial conditions. This loss of amplitude is distict from $T_2$-decoherence with the difference being most drastic for environments with real or pseudo-gaps. This result is explained by bandwith effects in quantum noise as well as in terms of higher-order phase-breaking processes. For several experiments, such gapped environments are identified. We confirm that this physics is valid beyond the pure dephasing point.

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