Fig. 2: Numerical results of predicting properties of rotational 60-qubit GHZ states.
From: Efficient learning for linear properties of bounded-gate quantum circuits
a Two-point correlation. Exact values and ML predictions of the expectation value of the correlation function Cij = (XiXj + YiYj + ZiZj)/3 for all qubit pairs of 60-qubit GHZ states. The node’s color indicates the exact value and predicted value of the two subplots, respectively. b, c PREDICTION ERROR. Subplot (b) depicts the root mean squared (RMS) prediction error of the trained ML model with varied truncation Λ and number of training examples n. Subplot (c) shows the RMS prediction error of the trained ML model with varied truncation Λ and the shot number T. The setting Λ = 3 refers to the full expansion.
