  Polarized light passing through twisted special wave plates show entangled
state of both SAM and OAM. The variable circular and linear retarders (VCR and
VLR) are studied here from the view point of quantum processing of entangled
states. Interestingly the geometric phase in association with twist dependent
gain of OAM has been discussed here. As an application of VLR, the origin of
gradual flattened shape of wave fronts through successive array of antennas
(QHQ) has been explained through new physical approach of the concurrence of
entangled states.
