A fixed time-encoding, not barren-plateau gradient vanishing, sets a 33-dimensional capacity ceiling (11 accessible Fourier modes per observable) that prevents a four-qubit variational QPINN from fitting Lorenz-63.
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An architectural capacity ceiling, not a barren plateau: why a fixed-encoding variational quantum circuit cannot fit the Lorenz-63 attractor
A fixed time-encoding, not barren-plateau gradient vanishing, sets a 33-dimensional capacity ceiling (11 accessible Fourier modes per observable) that prevents a four-qubit variational QPINN from fitting Lorenz-63.