Abstract
We derive a Bell inequality based on a generalized quasiprobability function, which is parametrized by one nonpositive real value. Two types of known Bell inequalities formulated in terms of the Wigner and the 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 function allows the lowest detection efficiency for violations of local realism.
- Received 21 June 2009
DOI:https://doi.org/10.1103/PhysRevA.80.022104
©2009 American Physical Society