Robust Trapped-Ion Quantum Logic Gates by Continuous Dynamical   Decoupling
  We introduce a novel scheme that combines phonon-mediated quantum logic gates in trapped ions with the benefits of continuous dynamical decoupling. We demonstrate theoretically that a strong driving of the qubit decouples it from external magnetic-field noise, enhancing the fidelity of two-qubit quantum gates. Moreover, the scheme does not require ground-state cooling, and is inherently robust to undesired ac-Stark shifts. The underlying mechanism can be extended to a variety of other systems where a strong driving protects the quantum coherence of the qubits without compromising the two-qubit couplings. 
A. Bermudez, P. O. Schmidt, M. B. Plenio, and A. Retzker
quant-ph cond-mat.quant-gas