Fig. 5: Bell inequality violation versus measurement basis offset angle.
From: Loophole-free Bell inequality violation with superconducting circuits
a, Quantum correlations ⟨xy⟩(a,b) of individual Bell tests versus offset angle θ. The 17 data points are results of individual Bell tests with \({n}_{max}/17=\mathrm{61,680}\) trials each, incremented by θ = π/8. The dashed curves are calculated using a master equation simulation. b, Corresponding S values calculated from the data shown in a. Points are experimental data, and the dashed red line is extracted from a master equation simulation. Error bars are roughly on the order of the marker size, see text for details. c, Measured S values of 13 individual Bell tests, with \({n}_{max}\,/13=\mathrm{80,659}\) trials each, and offset angles around the expected optimum value \({\theta }_{{S}_{\max }}\) incremented by θ = π/32. d, Same as in c but for the expected optimum value \({\theta }_{{S}_{\min }}\). The green lines in b–d mark the threshold value |S| = 2, and all points in the green shaded region correspond to Bell tests that violate the CHSH inequality.
