Suppressing logical errors on an encoded subspace using logical dynamical decoupling. Part II: Experiment

Logical dynamical decoupling (LDD), i.e., utilizing the logical operators of quantum error correction codes as dynamical decoupling pulses, is shown to enhance the robustness of the encoded subspace beyond the limit set by the code's distance. In this talk, using the IBM cloud quantum processors, we experimentally demonstrate the implementation of LDD on an encoded subspace and show that they can simultaneously suppress the logical and physical errors, thus significantly enhancing the fidelity of the encoded logical states.