Optimal Dynamical Decoherence Control of a Qubit
Goren Gordon, Gershon Kurizki, Daniel A. Lidar · Physical Review Letters · 2008
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.