Air-stable bright entangled photon-pair source from graphene-encapsulated van der Waals ferroelectric NbOI2
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866908866013298688 |
|---|---|
| author | Joshi, Mayank Jiang, Mengting Xing, Yu Lu, Yuerui Zhao, Jie Lam, Ping Koy Assad, Syed M Ma, Xuezhi Cho, Young-Wook |
| author_facet | Joshi, Mayank Jiang, Mengting Xing, Yu Lu, Yuerui Zhao, Jie Lam, Ping Koy Assad, Syed M Ma, Xuezhi Cho, Young-Wook |
| contents | Van der Waals (vdW) ferroelectrics are emerging nonlinear photonic materials that combine large second-order susceptibility \c{hi}(2) with heterostructure compatibility, offering an attractive route toward miniaturized spontaneous parametric down-conversion (SPDC) sources. However, vdW SPDC sources operating under continuous irradiation in air remain limited in low brightness and poor operational stability, as oxygen and moisture exposure, together with pump-induced heating, lead to material degradation and permanent damage. Here we demonstrate an air-stable, bright SPDC source based on ferroelectric NbOI2 enabled by graphene encapsulation. Graphene provides robust environmental protection and can effectively supress pump induced degradation by enhancing heat dissipation. We report a record photon-pair generation absolute rate of 258 Hz and a normalized brightness of 19,900 Hz/(mW.mm). Leveraging this stabilized platform, we further generate polarization entangled photon pairs with 94% fidelity with respect to the maximally entangled Bell states from graphene-encapsulated 90° twisted bilayer NbOI2. Our results establish a practical and air-stable vdW ferroelectric SPDC platform that overcomes key limitations of existing vdW quantum light sources and provides a viable pathway toward scalable, integrated entangled photon sources for on chip quantum photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_04082 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Air-stable bright entangled photon-pair source from graphene-encapsulated van der Waals ferroelectric NbOI2 Joshi, Mayank Jiang, Mengting Xing, Yu Lu, Yuerui Zhao, Jie Lam, Ping Koy Assad, Syed M Ma, Xuezhi Cho, Young-Wook Applied Physics Optics Quantum Physics Van der Waals (vdW) ferroelectrics are emerging nonlinear photonic materials that combine large second-order susceptibility \c{hi}(2) with heterostructure compatibility, offering an attractive route toward miniaturized spontaneous parametric down-conversion (SPDC) sources. However, vdW SPDC sources operating under continuous irradiation in air remain limited in low brightness and poor operational stability, as oxygen and moisture exposure, together with pump-induced heating, lead to material degradation and permanent damage. Here we demonstrate an air-stable, bright SPDC source based on ferroelectric NbOI2 enabled by graphene encapsulation. Graphene provides robust environmental protection and can effectively supress pump induced degradation by enhancing heat dissipation. We report a record photon-pair generation absolute rate of 258 Hz and a normalized brightness of 19,900 Hz/(mW.mm). Leveraging this stabilized platform, we further generate polarization entangled photon pairs with 94% fidelity with respect to the maximally entangled Bell states from graphene-encapsulated 90° twisted bilayer NbOI2. Our results establish a practical and air-stable vdW ferroelectric SPDC platform that overcomes key limitations of existing vdW quantum light sources and provides a viable pathway toward scalable, integrated entangled photon sources for on chip quantum photonics. |
| title | Air-stable bright entangled photon-pair source from graphene-encapsulated van der Waals ferroelectric NbOI2 |
| topic | Applied Physics Optics Quantum Physics |
| url | https://arxiv.org/abs/2603.04082 |