Extended Weyl-Heisenberg algebra, phase operator, unitary depolarizers   and generalized Bell states
  Finite dimensional representations of extended Weyl-Heisenberg algebra are studied both from mathematical and applied viewpoints. They are used to define unitary phase operator and the corresponding eigenstates (phase states). It is also shown that the unitary depolarizers can be constructed in a general setting in terms of phase operators. Generation of generalized Bell states using the phase operator is presented and their expressions in terms of the elements of mutually unbiased bases are given. 
M. Daoud and E. H. El Kinani
quant-ph