title: Optimal dynamical decoherence control of a qubit.
abstract: We present a theory of dynamical control by modulation for optimal decoherence reduction. The theory 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.
authors.affiliation: Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Goren
authors.initials: G
authors.lastname: Gordon
authors.forename: Gershon
authors.initials: G
authors.lastname: Kurizki
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Lidar