| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 21, Number 1, 2025
|
|
|---|---|---|
| Article Number | 3 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/jeos/2024047 | |
| Published online | 22 January 2025 | |
Research Article
Ultra-broad Schmidt modes for biphoton states generated by SPDC in the chirped QPM crystals
1
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2
Zhejiang Province Key Laboratory of Quantum Precision Measurement, College of Physics, Zhejiang University of Technology, Hangzhou 310023, China
* Corresponding authors: zhan@zjut.edu.cn; whlin@zjut.edu.cn; qlin@zjut.edu.cn
Received:
8
November
2024
Accepted:
4
December
2024
In the realm of quantum optics, the manipulation and characterization of biphoton states hold significant importance for advancing quantum information processing and communication technologies. This study explores the Schmidt decomposition of ultra-broad biphoton states, revealing that most modes are fulfilled with the frequency response points, and certain modes exhibit exceptionally broad Schmidt spectra. These Schmidt modes in frequency domain are significantly reshaped and widened by a crystal at a moderate chirp-rate when pump bandwidth is about several Giga-Hertz.
Key words: Biphoton / SPDC / Schmidt modes
© The Author(s), published by EDP Sciences, 2025
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