Universal unitary gate for single-photon spinorbit four-dimensional states

Abstract

The recently demonstrated possibility of entangling opposite values of the orbital angular momentum (OAM) of a photon with its spin enables the realization of nontrivial one-photon spinorbit four-dimensional states for quantum information purposes. Hitherto, however, an optical device able to perform arbitrary unitary transformations on such spinorbit photon states has not been proposed yet. In this work we show how to realize such a ``universal unitary gate'' device, based only on existing optical technology, and describe its operation. Besides the quantum information field, the proposed device may find applications wherever an efficient and convenient manipulation of the combined OAM and spin of light is required.

7 pages, 2 figures

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• Implementation of one-dimensional quantum walks on spin-orbital angular momentum space of photons
• Effects of misalignments in the optical vortex transformation performed by holograms with embedded phase singularity
• Orbital angular momentum based intra- and inter- particle entangled states generated via a quantum dot source
• Remote information concentration and multipartite entanglement in multilevel systems
• Liquid crystal spatial-mode converters for the orbital angular momentum of light
• Entanglement-based quantum deep learning
• Implementing the Deutsch's algorithm with spin-orbital angular momentum of photon without interferometer
• Generation of optical vortex light beams by volume holograms with embedded phase singularity
• Transformation of Optical Vortex Beams by Holograms with Embedded Phase Singularity
• Programmable Unitary Operations for Orbital Angular Momentum Encoded States