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    Quantum state designs via magic teleportation

    Hugo Lóio1,7,*, Guglielmo Lami1,†, Lorenzo Leone2,3, Max McGinley4, Xhek Turkeshi5,6, and Jacopo De Nardis1

    • *Contact author: hugo.loio@cyu.fr
    • †Contact author: glami@cyu.fr

    Phys. Rev. Applied 26, 054017 – Published 5 November, 2026

    DOI: https://doi.org/10.1103/t3pz-8vvf

    Abstract

    We investigate how nonstabilizer resources enable the emergence of quantum state designs within the projected ensemble. Starting from initial states with finite magic and applying resource-free Clifford circuits to scramble them, we analyze the ensemble generated by performing projective Pauli measurements on a subsystem of the final state. Using both analytical arguments and large-scale numerics, we show that the projected ensemble converges toward a state k-design with an error that decays exponentially with the kth stabilizer Rényi entropy of the premeasurement state, via a magic-induced design ansatz (MIDA) that we introduce. We identify a scaling form that depends on the initial state only through its magic Mk, which we corroborate for distinct classes of initial states through numerical simulations and analytical calculations of the frame potential. For finite-depth Clifford unitaries, we show that the timescales at which state designs emerge are controlled by the transport of magic. We identify a “magic teleportation” mechanism whereby non-Clifford resources injected locally spread through Clifford scrambling and measurements across distances beyond the light-cone. Our results demonstrate that an amount of magic scaling with the probed subsystem size, yet independent of the total system size, suffices to generate highly random states, providing a systematic route toward generating quantum state designs in early fault-tolerant devices.

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