05984379

j

05984379 Evans, Ruffin Pfister, Olivier On the experimental violation of Mermin's inequality with imperfect measurements. Quantum Inf. Comput. 11, No. 9-10, 820-839 (2011). 2011 Rinton Press, Paramus, NJ EN quantum information quantum entanglement Bell inequality Mermin inequality continuous-variable entanglement Summary: We investigate theoretically the feasibility of an experimental test of the Bell-type inequality derived by Mermin for correlated spins larger than $1/2$. Using the Schwinger representation, we link the output fields of two two-mode squeezers in order to create correlated effective spins between two observers. Spin measurements will be performed by photon-number-resolved photodetection, which has recently come of age. We examine the effect of nonideal detection quantum efficiency -- and any other optical loss -- on the violation margin of Mermin's inequality. We find that experimental violation is well accessible for spins larger than 1, for quantum efficiencies compatible with the current state of the art.