Fig. 3: Control operations for the quantum supremacy circuits. | Nature

Fig. 3: Control operations for the quantum supremacy circuits.

From: Quantum supremacy using a programmable superconducting processor

Fig. 3

a, Example quantum circuit instance used in our experiment. Every cycle includes a layer each of single- and two-qubit gates. The single-qubit gates are chosen randomly from \(\{\sqrt{X},\sqrt{Y},\sqrt{W}\}\), where  \(W=(X+Y)/\sqrt{2}\) and gates do not repeat sequentially. The sequence of two-qubit gates is chosen according to a tiling pattern, coupling each qubit sequentially to its four nearest-neighbour qubits. The couplers are divided into four subsets (ABCD), each of which is executed simultaneously across the entire array corresponding to shaded colours. Here we show an intractable sequence (repeat ABCDCDAB); we also use different coupler subsets along with a simplifiable sequence (repeat EFGHEFGH, not shown) that can be simulated on a classical computer. b, Waveform of control signals for single- and two-qubit gates.

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