Photonic variational circuits exhibit polynomial gradient decay in some postselection regimes and exponential decay in others, governed by postselection geometry rather than Hilbert-space dimension.
Experimental realization of any discrete unitary operator
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Pre-Asymptotic Trainability in Photonic Variational Circuits under Postselection
Photonic variational circuits exhibit polynomial gradient decay in some postselection regimes and exponential decay in others, governed by postselection geometry rather than Hilbert-space dimension.