We show that inconclusive photon subtraction (IPS) on twin-beam produces non-Gaussian states that violate Bell's inequality in the phase-space. The violation is larger than for the twin-beam itself irrespective of the IPS quantum efficiency. The explicit expression of IPS map is given both for the density matrix and the Wigner function representations.
@article{arxiv.quant-ph/0406030,
title = {Degaussification of twin-beam and nonlocality in the phase space},
author = {Stefano Olivares and Matteo G. A. Paris},
journal= {arXiv preprint arXiv:quant-ph/0406030},
year = {2009}
}