Quantitative Treatment of Decoherence
arXiv:cond-mat/0610756 · doi:10.1007/978-3-540-79365-6_8
Abstract
We outline different approaches to define and quantify decoherence. We argue that a measure based on a properly defined norm of deviation of the density matrix is appropriate for quantifying decoherence in quantum registers. For a semiconductor double quantum dot qubit, evaluation of this measure is reviewed. For a general class of decoherence processes, including those occurring in semiconductor qubits, we argue that this measure is additive: It scales linearly with the number of qubits.
Revised version, 26 pages, in LaTeX, 3 EPS figures
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