Composite-pulse robustness is explained as a classical caustic: ensemble-averaged stability matrix elements in canonical (azimuth, cosθ) Bloch-sphere coordinates collapse exactly when the ensemble refocuses.
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The robustness of composite pulses elucidated by classical mechanics: Stability around the globe
Composite-pulse robustness is explained as a classical caustic: ensemble-averaged stability matrix elements in canonical (azimuth, cosθ) Bloch-sphere coordinates collapse exactly when the ensemble refocuses.