Optimization of Bell's inequality violation for continuous variable systems

Two mode squeezed vacuum states allow Bell's inequality violation (BIV) for all non-vanishing squeezing parameter (ζ). We show that for finite ζ in continuous variable systems additional parameters are present for optimizing BIV. Thus the expectation value of the Bell operator depends, in addition to the orientation parameters, on configuration parameters. Optimization of these configurational parameters leads to a unique maximal BIV that depends only on ζ