Experimental determination of the degree of quantum polarisation of   continuous variable states
  We demonstrate excitation-manifold resolved polarisation characterisation of continuous-variable (CV) quantum states. In contrast to traditional characterisation of polarisation that is based on the Stokes parameters, we experimentally determine the Stokes vector of each excitation manifold separately. Only for states with a given photon number does the methods coincide. For states with an indeterminate photon number, for example Gaussian states, the employed method gives a richer and more accurate description. We apply the method both in theory and in experiment to some common states to demonstrate its advantages. 
Christian Kothe, Lars Skovgaard Madsen, Ulrik Lund Andersen, Gunnar   Bj\"ork
quant-ph