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Optimized Spectral and Interferometric Techniques for the Certification of ETPA
Pablo Yepiz-Graciano1, Gabriel Ramos-Ortiz2, Roberto Ramírez-Alarcón2
1Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, CDMX 04510, México.
The Journal of Physical Chemistry. A
|December 22, 2025
Summary
Entangled Two-Photon Absorption (ETPA) detection is improved by using spectral signatures to distinguish it from background noise. This method models molecules as filters and analyzes photon interactions to isolate ETPA signals.
Area of Science:
- Quantum optics
- Nonlinear spectroscopy
- Photonic entanglement
Background:
- Entangled Two-Photon Absorption (ETPA) exhibits significant discrepancies in reported cross-section values.
- Distinguishing ETPA from background processes like linear absorption and scattering is experimentally challenging.
Purpose of the Study:
- To develop a reliable method for unequivocally certifying the presence of ETPA.
- To isolate the ETPA contribution by utilizing its unique spectral signature.
Main Methods:
- Modeling molecules as two-photon notch filters.
- Inducing asymmetric overlap with the joint spectral intensity (JSI) of incident photons.
- Analyzing distortions in the transmitted JSI and reductions in Hong-Ou-Mandel (HOM) dip visibility.
Main Results:
- Demonstrated that spectral asymmetry can isolate ETPA signals.
- Quantified the experimental conditions and absorption efficiency limits for ETPA detection.
- Presented preliminary experimental results for ETPA detection limits using RhB dye.
Conclusions:
- The proposed spectral signature method offers a robust approach to certify ETPA.
- The study provides a framework for overcoming experimental challenges in ETPA detection.
- Further research can refine detection limits and explore applications of this technique.
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