Optimal Dynamical Decoherence Control of a Qubit

Abstract

A theory of dynamical control by modulation for optimal decoherence reduction is developed. It is based on the non-Markovian Euler-Lagrange equation for the energy-constrained field that minimizes the average dephasing rate of a qubit for any given dephasing spectrum.

6 pages, including 2 figures and an appendix

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