Robust Dynamical Decoupling for the Manipulation of a Spin Network via a Single Spin

Understand

High-fidelity control of quantum systems is crucial for quantum information processing, but is often limited by perturbations from the environment and imperfections in the applied control fields.

• Here, we investigate the combination of dynamical decoupling (DD) and robust optimal control (ROC) to address this problem.
• In this combination, ROC is employed to find robust shaped pulses, wherein the directional derivatives of the controlled dynamics with respect to control errors are reduced to a desired order.
• Then, we incorporate ROC pulses into DD sequences, achieving a remarkable improvement of robustness against multiple error channels.