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Updated: Dec 17, 2025

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

Metalens-array-based high-dimensional and multiphoton quantum source.

Lin Li^1,2,3,4, Zexuan Liu^1,5,6, Xifeng Ren^7,8

¹National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China.

Science (New York, N.Y.)

|June 27, 2020

Summary

This summary is machine-generated.

Researchers developed a 100-path quantum photon source using a metalens array for advanced quantum-optical technologies. This breakthrough enables high-dimensional entanglement and multiphoton generation for integrated quantum devices.

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Last Updated: Dec 17, 2025

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Area of Science:

Quantum optics
Metasurface technology
Integrated photonics

Background:

Two-dimensional metasurfaces offer flexible light-field manipulation for quantum-optical applications.
Existing quantum photon sources face limitations in scalability and controllability.

Purpose of the Study:

To develop a scalable and controllable quantum photon source.
To demonstrate high-dimensional entanglement and multiphoton generation using metasurfaces.

Main Methods:

Integration of a metalens array with a nonlinear crystal.
Fabrication of a 10x10 metalens array for spontaneous parametric down-conversion.
Encoding different phases using metalenses to generate entangled photon pairs.

Main Results:

Demonstration of a 100-path spontaneous parametric down-conversion photon-pair source.
Achieved two-, three-, and four-dimensional two-photon path entanglement with high fidelities (98.4%, 96.6%, 95.0%).
Observed four-photon and six-photon generation with high photon indistinguishability.

Conclusions:

The metalens-array-based quantum photon source is compact, stable, and controllable.
This technology presents a new platform for integrated quantum devices.
Enables advancements in high-dimensional entanglement and multiphoton-state generation.