Determining the dimensionality of bipartite orbital-angular-momentum entanglement using multi-sector phase masks

TL;DR

This paper demonstrates a method to measure the high-dimensional entanglement of orbital angular momentum states using multi-sector phase masks implemented with spatial light modulators, achieving a Schmidt number of about 50.

Contribution

The paper introduces a SLM-based multi-sector phase analyser technique to quantify the dimensionality of OAM entanglement in a novel way.

Findings

Measured a Schmidt number of approximately 50 for OAM entanglement.

Validated the effectiveness of SLM-based multi-sector phase masks for high-dimensional entanglement analysis.

Showed that the method can probe the Shannon dimensionality of OAM states.

Abstract

The Shannon dimensionality of orbital angular momentum (OAM) entanglement produced in spontaneous parametric down-conversion can be probed by using multi-sector phase analysers. We demonstrate a spatial light modulator-based implementation of these analysers, and use it to measure a Schmidt number of about 50.