We describe a new Bell test for two-particle entangled systems that engages an unbounded continuous variable. The continuous variable state is allowed to be arbitrary and inaccessible to direct measurements. A systematic method is introduced to perform the required measurements indirectly. Our results provide new perspectives on both the study of local realistic theory for continuous-variable systems and on the nonlocal control theory of quantum information.
@article{arxiv.1302.6134,
title = {Bell violation for unknown continuous-variable states},
author = {X. -F. Qian and C. J. Broadbent and J. H. Eberly},
journal= {arXiv preprint arXiv:1302.6134},
year = {2014}
}