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Updated: Jun 10, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Entangled photon-pair generation in nonlinear thin-films.

Elkin A Santos¹, Maximilian A Weissflog^1,2, Thomas Pertsch^1,3

¹Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

We developed a new theoretical framework for spontaneous parametric down-conversion in thin films. This enables precise control over entangled photon-pair generation for quantum technologies.

Keywords:

Fabry–Pérot interference entanglement nano-optics nonlinear sources

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Last Updated: Jun 10, 2026

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Area of Science:

Quantum optics
Nonlinear optics
Materials science

Background:

Spontaneous parametric down-conversion (SPDC) is crucial for generating entangled photon pairs.
Thin-film nonlinear optical devices offer miniaturization potential for quantum light sources.
Existing theoretical formalisms often lack the necessary detail for sub-wavelength thin films.

Purpose of the Study:

To develop a comprehensive theoretical formalism for SPDC in nonlinear thin films.
To investigate the influence of thin-film properties and Fabry-Pérot effects on photon-pair generation.
To identify conditions for generating maximally entangled photon pairs in these systems.

Main Methods:

Development of a fully vectorial and non-paraxial formalism.
Inclusion of sub-wavelength thickness, Fabry-Pérot effects, and material absorption.
Analysis of far-field radiation properties and entanglement generation dynamics.

Main Results:

The formalism accurately describes SPDC in thin films, including Fabry-Pérot interferences.
Thickness-dependent effects on far-field radiation patterns were elucidated.
Conditions for generating maximally polarization-entangled photon pairs were determined.

Conclusions:

The developed formalism provides essential theoretical understanding for nonlinear thin-film SPDC.
This work facilitates the design of advanced thin-film-based quantum light sources.
Optimized thin-film structures can lead to efficient generation of high-quality entangled photons.