Macroscopic Bell States and the Higher-Order Degree of Polarization
  We study polarization properties of the macroscopic analogues of two-photon Bell states. The effect of hidden polarization, i.e., polarization in the second (and higher) orders in the intensity is observed for the triplet states while the singlet one is demonstrated to be nearly unpolarized at least up to the fourth order. The arbitrary-order degree of polarization is introduced and applied to the macroscopic Bell states. 
Timur Sh. Iskhakov, Ivan N. Agafonov, Maria V. Chekhova, Georgy O.   Rytikov, Gerd Leuchs
quant-ph