A single messenger qubit in a layerwise residual quantum circuit increases gradient variance by up to 100x and speeds convergence 4-6x versus standard circuits while preserving expressibility.
The PID controller strikes back: Classical controller helps mitigate barren plateaus in noisy variational quantum circuits
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Q-LINK: Quantum Layerwise Information Residual Network via a Messenger Qubit for Barren Plateaus Mitigation
A single messenger qubit in a layerwise residual quantum circuit increases gradient variance by up to 100x and speeds convergence 4-6x versus standard circuits while preserving expressibility.