Figure 2
From: Simplified quantum optical Stokes observables and Bell’s theorem
(a) Critical efficiency \(\eta _c\) versus \(\Gamma \) for the CHSH inequalities for the BSV state. A blue curve represents \(\eta _c\) for sign approach and a green dashed curve for normalized Stokes operators. (b) Critical value of q versus \(\Gamma \) for the BSV state. A blue curve represents \(q_c\) for sign approach and a green dashed curve for normalized stokes operators. Assuming that asymptotic behaviour of violation of CHSH inequality for sing parameters discussed in “Violation of Bell inequality for four mode squeezed vacuum—asymptotic behaviour” section is correct the \(q_c\) for the sign Stokes operators goes to 1 in the limit \(\Gamma \rightarrow \infty \).
