Quantum-enhanced second harmonic generation beyond the photon pairs regime
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915716230283264 |
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| author | Dickinson, Thomas Afxenti, Ivi Astrauskaite, Giedre Hirsch, Lennart Nerenberg, Samuel Jedrkiewicz, Ottavia Faccio, Daniele Müllenbroich, Caroline Gatti, Alessandra Clerici, Matteo Caspani, Lucia |
| author_facet | Dickinson, Thomas Afxenti, Ivi Astrauskaite, Giedre Hirsch, Lennart Nerenberg, Samuel Jedrkiewicz, Ottavia Faccio, Daniele Müllenbroich, Caroline Gatti, Alessandra Clerici, Matteo Caspani, Lucia |
| contents | Two-photon processes are crucial in applications like microscopy and microfabrication, but their low cross-section requires intense illumination and limits, e.g., the penetration depth in nonlinear microscopy. Entangled states have been proposed to enhance the efficiency of two-photon interactions and have shown effectiveness at low intensities. This quantum enhancement is generally believed to be lost at high intensities, for more than one photon per mode, raising doubts about its usefulness. We explored experimentally and theoretically two-photon processes driven by entangled photons at intensities beyond this threshold and compared the results with the classical case. We found that a quantum advantage can still be observed at nearly one order of magnitude higher intensities than previously assumed. Our findings show a potential path for exploiting quantum-enhanced two-photon processes in practical applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15249 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum-enhanced second harmonic generation beyond the photon pairs regime Dickinson, Thomas Afxenti, Ivi Astrauskaite, Giedre Hirsch, Lennart Nerenberg, Samuel Jedrkiewicz, Ottavia Faccio, Daniele Müllenbroich, Caroline Gatti, Alessandra Clerici, Matteo Caspani, Lucia Quantum Physics Optics Two-photon processes are crucial in applications like microscopy and microfabrication, but their low cross-section requires intense illumination and limits, e.g., the penetration depth in nonlinear microscopy. Entangled states have been proposed to enhance the efficiency of two-photon interactions and have shown effectiveness at low intensities. This quantum enhancement is generally believed to be lost at high intensities, for more than one photon per mode, raising doubts about its usefulness. We explored experimentally and theoretically two-photon processes driven by entangled photons at intensities beyond this threshold and compared the results with the classical case. We found that a quantum advantage can still be observed at nearly one order of magnitude higher intensities than previously assumed. Our findings show a potential path for exploiting quantum-enhanced two-photon processes in practical applications. |
| title | Quantum-enhanced second harmonic generation beyond the photon pairs regime |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2504.15249 |