Perumangatt, ChithrabhanuChithrabhanuPerumangattLal, NijilNijilLalAnwar, AliAliAnwarReddy, Salla GangiSalla GangiReddySingh, R. P.R. P.Singh2025-08-222025-08-222016-07-012331-8422https://d8.irins.org/handle/IITG2025/18184We 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.en-USQuantum Physicse-Printe-Print123456789/615