We present a near-optimal quantum dynamical decoupling scheme that eliminates general decoherence of a qubit to order n using O(n^2) pulses, an exponential decrease in pulses over all previous decoupling methods. Numerical simulations of a qubit coupled to a spin bath demonstrate the superior performance of the new pulse sequences.
@article{arxiv.0908.4490,
title = {Near-optimal dynamical decoupling of a qubit},
author = {Jacob R. West and Bryan H. Fong and Daniel A. Lidar},
journal= {arXiv preprint arXiv:0908.4490},
year = {2010}
}