Robust Trapped-Ion Quantum Logic Gates by Continuous Dynamical Decoupling

Details Robust Trapped-Ion Quantum Logic Gates by Continuous Dynamical Decoupling Robust Trapped-Ion Quantum Logic Gates by Continuous Dynamical Decoupling

2011-10-09

arxiv.org/abs/1110.1870v2

Phys. Rev. A 85, 040302(R) (2012)

Physics

Quantum Physics

Slightly longer than the published version

Scientific paper

10.1103/PhysRevA.85.040302

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.

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