Journal
PHYSICAL REVIEW A
Volume 79, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.012316
Keywords
correlation methods; encoding; group theory; Hilbert spaces; Markov processes; quantum computing; quantum entanglement
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Funding
- Belgian Interuniversity Attraction Poles Programme [P6/02]
- Polish research network LFPPI
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We consider, within the algebraic formalism, the time dependence of fidelity for qubits encoded in 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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