Photon subtracted states and enhancement of nonlocality in the presence of noise

We address nonlocality of bipartite continuous variable systems in the presence of dissipation and noise. Three nonlocality tests have been considered, based on the measurement of displaced parity, field quadrature and pseudospin operator, respectively. Nonlocality of twin-beams has been investigated, as well as that of their non-Gaussian counterparts obtained by inconclusive subtraction of photons. Our results indicate that (i) nonlocality of twin-beams is degraded but not destroyed by noise; (ii) photon subtraction enhances nonlocality in the presence of noise, especially in the low-energy regime.