Testing quantum nonlocality by generalized quasiprobability functions
arXiv:0908.0541 · doi:10.1103/PhysRevA.80.022104
Abstract
We derive a Bell inequality based on a generalized quasiprobability function which is parameterized by one non-positive real value. Two types of known Bell inequalities formulated in terms of the Wigner and Q functions are included as limiting cases. We investigate violations of our Bell inequalities for single photon entangled states and two-mode squeezed vacuum states when varying the detector efficiency. We show that the Bell inequality for the Q function allows the lowest detection efficiency for violations of local realism.
6 pages, 3 figures