Fig. 6: The estimator spreads to mitigate global depolarizing noise on a 50-qubit system. | npj Quantum Information

Fig. 6: The estimator spreads to mitigate global depolarizing noise on a 50-qubit system.

From: Fundamental limits of quantum error mitigation

Fig. 6

Green curves: \({{\Delta }}{e}_{\max }\) for probabilistic error cancellation (dashed) and the lower bound for unbiased (1, 1)-mitigation protocols (solid). Brown curves: ΔeA with \(A=\frac{1}{2}{\otimes }_{i = 1}^{n}{X}_{i}\) for 2-copy virtual distillation with GHZ state inputs (dashed) and the lower bound for (2, 1)-mitigation protocols with the same bias (solid). Triangles and rectangles: ΔeA with \(A=\frac{1}{2}{\otimes }_{i = 1}^{n}{X}_{i}\) for 1st order noise extrapolation (triangles) and a lower bound for (1, 2)-mitigation protocols with the same bias (rectangles).

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