Multiplexing Free-Space Channels using Twisted Light

TL;DR

This paper presents an experimental interferometric method for multiplexing free-space optical channels using twisted light with orbital angular momentum, achieving high fidelity in superposition and mixture states for improved communication.

Contribution

The study introduces a novel interferometric protocol for multiplexing OAM states, capable of preparing superpositions and mixtures with high fidelity, advancing free-space optical communication techniques.

Findings

Achieved fidelities greater than 0.98 in state preparation.

Demonstrated multiplexing of odd and even OAM superpositions.

Validated the protocol's potential for standard free-space communication schemes.

Abstract

We experimentally demonstrate an interferometric protocol for multiplexing optical states of light, with potential to become a standard element in free-space communication schemes that utilize light endowed with orbital angular momentum (OAM). We demonstrate multiplexing for odd and even OAM superpositions generated using different sources. In addition, our technique permits one to prepare either coherent superpositions or statistical mixtures of OAM states. We employ state tomography to study the performance of this protocol, and we demonstrate fidelities greater than 0.98.