title: Optimized noise filtration through dynamical decoupling.
abstract: Recent studies have shown that applying a sequence of Hahn spin-echo pulses to a qubit system at judiciously chosen intervals can, in certain noise environments, greatly improve the suppression of phase errors compared to traditional dynamical decoupling approaches. By enforcing a simple analytical condition, we obtain sets of dynamical decoupling sequences that are designed for optimized noise filtration, but are independent of the noise spectrum up to a single scaling factor set by the coherence time of the system. These sequences are tested in a model qubit system, ;{9}Be;{+} ions in a Penning trap. Our combined theoretical and experimental studies show that in high-frequency-dominated noise environments with sharp high-frequency cutoffs this approach may suppress phase errors orders of magnitude more efficiently than comparable techniques can.
authors: National Institute of Standards Technology, Boulder, Colorado 80305, USA.
authors: Hermann
authors: H
authors: Uys
authors: Michael J
authors: MJ
authors: Biercuk
authors: John J
authors: JJ
authors: Bollinger