Decay of fidelity in terms of correlation functions

Details Decay of fidelity in terms of correlation functions Decay of fidelity in terms of correlation functions

2008-09-24

arxiv.org/abs/0809.4180v1

Physics

Quantum Physics

9 pages, no figures

Scientific paper

10.1103/PhysRevA.79.012316

We consider, within the algebraic formalism, the time dependence of fidelity
for qubits encoded into an open physical system. We relate the decay of
fidelity to the evolution of correlation functions and, in the particular case
of a Markovian dynamics, to the spectral gap of the generator of the semigroup.
The results are applicable to the analysis of models of quantum memories.

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