Retzker, Alex

Thursday, December 15, 2011
Time: 15:00
Place: HIT H 51
Host: Jonathan Home

Robust Trapped-Ion Quantum Logic Gates by Microwave Dynamical Decoupling

Alex Retzker
University of Ulm, Germany

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.