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Summary

Two-dimensional materials like NbOI2 are promising for generating entangled photons. This study shows NbOI2 is suitable for near-infrared polarization entangled photon generation, advancing quantum photonic devices.

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Area of Science:

Quantum optics and photonics
Materials science
Solid-state physics

Background:

Two-dimensional (2D) materials are explored for compact entangled photon sources.
Ferroelectric van der Waals materials offer ultrathin entangled photon generation via nonlinear optics.

Purpose of the Study:

Compare spontaneous parametric down conversion (SPDC) in NbOBr2 and NbOI2.
Demonstrate near-infrared polarization entangled photon generation.
Link material performance to crystal structure and optical properties.

Main Methods:

Experimental investigation of spontaneous parametric down conversion (SPDC).
Characterization of NbOBr2 and NbOI2 materials.
Analysis of generated entangled photon states and their properties.

Main Results:

NbOBr2 and NbOI2 demonstrate near-infrared polarization entangled photon generation.
NbOI2 is particularly suitable for near-infrared SPDC applications.
A high-fidelity polarization entangled state (concurrence of 0.90 ± 0.05) was directly generated from NbOI2.

Conclusions:

NbOX2 materials extend the wavelength range for SPDC sources.
NbOI2 emerges as a key material for integrated quantum photonics.
The study provides insights for developing future integrated quantum materials.