Crosstalk-robust dynamical decoupling for bipartite-topology quantum processors
Phys. Rev. Applied 25, 064041 – Published 10 June, 2026
DOI: https://doi.org/10.1103/r75m-b2d9
Abstract
We introduce a protocol that modifies dynamical decoupling (DD) sequences to be robust to static crosstalk when implemented with bounded control on 2-colorable qubit topologies. The protocol, which relies on modifications of the pulse timing, can be applied to any sequence with equidistant pulses. We motivate the method using suppression conditions identified through time-dependent perturbation theory. Theoretical findings are supported by demonstrations of widely studied sequences on several superconducting qubit devices offered by the IBM Quantum Platform. Using up to 20 qubits on fixed-coupler devices, we observe an at least 3 times improvement in the fidelity decay rate via our approach when compared with nonrobust DD variants. In addition, we leverage our approach to assess the impact of errors on tunable-coupler devices. We find that -robust sequences perform nearly equivalently to nonrobust DD, affirming the reduced impact of such errors in a tunable-coupler architecture. Nevertheless, our demonstrations indicate that fixed-coupler devices, when subject to DD protection, can outperform tunable-coupler devices. Our method broadens the scope of practical DD protocols: with modest overhead and a reasonable constraint on the qubit topology, the method attains significant performance improvements on modern quantum computing devices.