Fig. 7: The block W is in the first layer of V(θ), and the operator Oi acts on the topmost m qubits in the forward light-cone \({\mathcal{L}}\) of W.
From: Cost function dependent barren plateaus in shallow parametrized quantum circuits
Dashed thick lines indicate the backward light-cone of Oi. All but L − 1 blocks simplify to identity in Ωqp of Eq. (34).
