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Updated: Jan 8, 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

Monochromatic Unidirectional Electron-Driven Photon Source.

Yuxiang Chen¹, Yuchen Dai¹, Guangyi Tao¹

¹State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Nano-Optoelectronics Frontier Center of Ministry of Education, School of Physics, Peking University, Beijing 100871, China.

|December 16, 2025

Summary

This summary is machine-generated.

We developed a tunable electron-driven photon source (EDPHS) with high directionality and polarization purity. This breakthrough enables advanced nanoscale imaging and on-chip light sources.

Keywords:

cathodoluminescence directional emission surface plasmons toroidal excitations

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Area of Science:

Nanophotonics
Quantum Optics
Materials Science

Background:

High-energy electron beams interacting with nanostructures produce coherent radiation.
Electron-driven photon sources (EDPHS) are promising for nanophotonic applications, including integrated light sources and electron microscopy.

Purpose of the Study:

To achieve a monochromatic and unidirectional EDPHS with tunable wavelength and emission direction.
To explore the potential of selective toroidal dipole mode excitation for controlling EDPHS properties.

Main Methods:

Selective excitation of toroidal dipole modes in nanostructures.
Utilizing unique electromagnetic mode properties with low radiative losses.

Main Results:

Realization of a highly directional, linearly polarized EDPHS (DOLP 0.999).
Achieved a high quality factor (Q-factor) of 35.
Demonstrated tunability in both wavelength and emission direction.

Conclusions:

The developed EDPHS offers precise control over light properties at the nanoscale.
Exceptional monochromaticity and polarization purity make it ideal for coherent reference sources in electron microscopy, enabling ultrafast spectral interferometry and phase imaging for nanoscale dynamics.