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    Twinned Dynamical Decoupling

    Nayden P. Nedev and Nikolay V. Vitanov*

    • Center for Quantum Technologies, Department of Physics, Sofia University, 5 James Bourchier Boulevard, 1164 Sofia, Bulgaria

    • *Contact author: vitanov@phys.uni-sofia.bg

    Phys. Rev. Lett. 137, 170803 – Published 22 October, 2026

    DOI: https://doi.org/10.1103/m4dt-9rkf

    Abstract

    Systematic pulse-area errors limit the fidelity of quantum control across many qubit platforms. We introduce twinned dynamical decoupling, an analytic family of sequences T2n in which a pulse sequence is paired with its π-phase-shifted twin. This π-phase step cancels common-mode systematic pulse-area errors to all orders on exact resonance. Then the phases of the pulses in each of the constituent twins are determined in such a manner that detuning errors are suppressed to the highest possible order as well. We have derived a simple analytic formula for these phases applicable to arbitrary sequence length. We demonstrate the sequences with superconducting transmon qubits on the IBM Quantum processor ibm_torino and the IQM Quantum processor Garnet. The measured population plateaus agree closely with theory and show enhanced robustness compared to the most frequently used dynamical decoupling protocols.

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