Squeezed and entangled collinear gluon states at the non-perturbative   stage of QCD jet evolution
  At the non-perturbative stage of jet evolution, fluctuations of collinear gluons are less than those for coherent states that is indication of gluon squeezed states. We show that gluon entangled states which are closely related with two-mode squeezed states of gluon fields can appear by analogy with corresponding photon states in quantum optics. 
V.I. Kuvshinov, V.A. Shaparau