Quantum Information with Even/Odd States of Orbital Angular Momentum of Light

TL;DR

This paper explores the use of even/odd orbital angular momentum states of photons for quantum information processing, demonstrating methods for measurement, entanglement, Bell violation, and quantum cryptography.

Contribution

It introduces a novel approach to quantum information using even/odd OAM states, including measurement techniques and applications in entanglement and quantum protocols.

Findings

Bell inequality violation with even/odd OAM states

Successful quantum cryptography protocols demonstrated

Hyper and hybrid entanglement of OAM with polarization achieved

Abstract

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.