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Related Experiment Video

Updated: Jun 22, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Mode counting in high-dimensional orbital angular momentum entanglement.

M P van Exter¹, P S K Lee, S Doesburg

¹Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands. mvexter@molphys.leidenuniv.nl

|June 24, 2009

Summary

We quantified high-dimensional orbital angular momentum (OAM) entanglement in quantum-correlated photons using a tunable interferometer. This research reveals the number of OAM modes involved in entanglement, ranging from 1 to 8.

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Area of Science:

Quantum Optics
Quantum Information Science

Background:

Entanglement is a key quantum phenomenon enabling advanced technologies.
Orbital angular momentum (OAM) offers a high-dimensional degree of freedom for quantum information.

Purpose of the Study:

To investigate and quantify high-dimensional orbital angular momentum (OAM) entanglement in spatial modes of quantum-correlated photons.
To develop a method for measuring the number of OAM modes involved in photon entanglement.

Main Methods:

Utilized a multi-mode two-photon interferometer.
Incorporated an image rotator in one interferometer arm.
Measured two-photon visibility as a function of image rotation angle to determine the azimuthal Schmidt number.

Main Results:

Successfully measured the azimuthal Schmidt number, quantifying the dimensionality of OAM entanglement.
Demonstrated tunability of the number of entangled OAM modes from 1 to 8.
Confirmed the presence of high-dimensional entanglement in the spatial profiles of photons.

Conclusions:

The study provides a direct method for characterizing high-dimensional OAM entanglement.
The tunable nature of the setup allows for controlled investigation of entanglement dimensionality.
Findings contribute to the understanding and application of OAM in quantum communication and computation.