Robust Trapped-Ion Quantum Logic Gates by Microwave Dynamical Decoupling
A. Bermúdez, Piet O. Schmidt, Martin Bodo Plenio, Alex Retzker · arXiv (Cornell University) · 2011
We introduce a hybrid scheme that combines laser-driven phonon-mediated quantum logic gates in trapped ions with the benefits of microwave dynamical decoupling. We demonstrate theoretically that a strong driving of the qubit decouples it from the external magnetic noise, and thus enhances the fidelity of two-qubit quantum gates. Moreover, the scheme does not require ground-state cooling, is inherently robust to undesired ac-Stark shifts, and simplifies previous gate schemes thus decreasing the effort in their realization.