We show theoretically that Bell-type correlations can be observed between continuous variable measurements performed on a parametric source. An auxiliary measurement, performed on the detection environment, negates the possibility of constructing a local realistic description of these correlations.
@article{arxiv.quant-ph/0006057,
title = {Proposal for the Measurement of Bell-like Correlations from Continuous Variables},
author = {T. C. Ralph and W. J. Munro and R. E. S. Polkinghorne},
journal= {arXiv preprint arXiv:quant-ph/0006057},
year = {2009}
}