Quantitative Treatment of Decoherence

Details Quantitative Treatment of Decoherence Quantitative Treatment of Decoherence

2006-10-27

arxiv.org/abs/cond-mat/0610756v2

Electron Spin Resonance and Related Phenomena in Low Dimensional Structures, Topics in Applied Physics 115 (Springer, Berlin,

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revised version, 26 pages, in LaTeX, 3 EPS figures

Scientific paper

10.1007/978-3-540-79365-6_8

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.

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