Quantum Information with Even/Odd States of Orbital Angular Momentum of   Light
  We address the possibility of using even/odd states of orbital angular momentum (OAM) of photons for the quantum information tasks. Single photon qubit states and two photon entangled states in even/odd basis of OAM are considered. We present a method for the tomography and general projective measurement in even/odd basis. With the general projective measurement, we show the Bell violation and quantum cryptography with Bell's inequality. We also describe hyper and hybrid entanglement of even/odd OAM states along with polarization, which can be applied in the implementation of quantum protocols like super dense coding. 
Chithrabhanu Perumangatt, Nijil Lal, Ali Anwar, Salla Gangi Reddy and   R. P. Singh
quant-ph