Under a worst-case noise model, adaptive GHZ and W-state preparation can exponentially beat non-adaptive circuits only in narrow gate-vs-idling error regimes, and current IBM hardware is too noisy and too restricted to realize that advantage.
Quantum error correction below the surface code threshold
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Theoretical and experimental analysis of adaptive quantum computers
Under a worst-case noise model, adaptive GHZ and W-state preparation can exponentially beat non-adaptive circuits only in narrow gate-vs-idling error regimes, and current IBM hardware is too noisy and too restricted to realize that advantage.