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Updated: Feb 15, 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

Sorting Photons by Radial Quantum Number.

Yiyu Zhou¹, Mohammad Mirhosseini¹, Dongzhi Fu^1,2

¹The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.

Physical Review Letters

|January 13, 2018

Summary

This summary is machine-generated.

This study introduces a novel optical device using fractional Fourier transforms to sort photons by their radial profile, complementing existing orbital angular momentum sorters for complete light field characterization.

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Area of Science:

Quantum optics
Photonics
Wave optics

Background:

Laguerre-Gaussian (LG) modes form a complete basis for paraxial photon fields.
Existing methods sort photons by azimuthal index (orbital angular momentum, OAM).
A method for sorting by radial profile is needed for complete field characterization.

Purpose of the Study:

To propose and demonstrate a mode sorter for optical fields based on radial profile decomposition.
To utilize the fractional Fourier transform for efficient radial mode sorting.
To enable complete characterization of the transverse optical field profile.

Main Methods:

Implementation of a mode sorter utilizing the fractional Fourier transform.
Experimental characterization of the sorter's performance.
Separation of individual radial modes and superposition states.

Main Results:

Demonstration of efficient decomposition of optical fields by radial profile.
Successful separation of individual radial LG modes.
Successful separation of superposition states of radial modes.

Conclusions:

The proposed fractional Fourier transform-based scheme efficiently sorts optical fields by radial profile.
The method can achieve unit efficiency, suitable for quantum light applications.
This approach, combined with OAM sorters, allows complete transverse field characterization.