Single Spatio-Temporal Mode Bright Twin-Beam Source Across the Near- and Mid-Infrared
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866909044433747968 |
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| author | Demontigny, Gabriel Cusson, Patrick Elorza, Amauri Perraton Zapata, Esteban Murillo Martel, Eli Rasputnyi, Andrei Chekhova, Maria Virally, Stéphane Seletskiy, Denis |
| author_facet | Demontigny, Gabriel Cusson, Patrick Elorza, Amauri Perraton Zapata, Esteban Murillo Martel, Eli Rasputnyi, Andrei Chekhova, Maria Virally, Stéphane Seletskiy, Denis |
| contents | We introduce an ultrafast, bright, entangled twin-beam source generated by type-0 parametric down-conversion in periodically-poled lithium niobate at MHz repetition rate, with continuously tunable Schmidt number $K$ set by the pump pulse duration. Photon-number statistics characterization via $g^{(2)}(0)$ and singular-value decomposition of the signal spectral density matrix yield $K\simeq1.05$ and $K\simeq1.03$, respectively, maintained over multiple orders of magnitude in brightness. Group-delay dispersion of the pump drives a continuous transition from single-mode operation to a controlled multimode regime, consistent with the temporal gain window departing from the inverse phase-matching bandwidth. Strong non-degeneracy of the source (signal at 1.37 um, idler at 4.0 um, $\sim 100$ fs duration) decouples a mid-infrared interaction wavelength, which overlaps with molecular vibrational resonances, from a near-infrared detection band, establishing a practical platform for quantum-enhanced metrology, nonlinear interferometry, and mid-infrared spectroscopic sensing. We show that in the bright few-mode limit, the total entanglement resource is clearly separated between modal and occupational degrees of freedom, and that our source allocates up to 95-97% of that resource to the occupational sector. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_15385 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Single Spatio-Temporal Mode Bright Twin-Beam Source Across the Near- and Mid-Infrared Demontigny, Gabriel Cusson, Patrick Elorza, Amauri Perraton Zapata, Esteban Murillo Martel, Eli Rasputnyi, Andrei Chekhova, Maria Virally, Stéphane Seletskiy, Denis Quantum Physics Optics We introduce an ultrafast, bright, entangled twin-beam source generated by type-0 parametric down-conversion in periodically-poled lithium niobate at MHz repetition rate, with continuously tunable Schmidt number $K$ set by the pump pulse duration. Photon-number statistics characterization via $g^{(2)}(0)$ and singular-value decomposition of the signal spectral density matrix yield $K\simeq1.05$ and $K\simeq1.03$, respectively, maintained over multiple orders of magnitude in brightness. Group-delay dispersion of the pump drives a continuous transition from single-mode operation to a controlled multimode regime, consistent with the temporal gain window departing from the inverse phase-matching bandwidth. Strong non-degeneracy of the source (signal at 1.37 um, idler at 4.0 um, $\sim 100$ fs duration) decouples a mid-infrared interaction wavelength, which overlaps with molecular vibrational resonances, from a near-infrared detection band, establishing a practical platform for quantum-enhanced metrology, nonlinear interferometry, and mid-infrared spectroscopic sensing. We show that in the bright few-mode limit, the total entanglement resource is clearly separated between modal and occupational degrees of freedom, and that our source allocates up to 95-97% of that resource to the occupational sector. |
| title | Single Spatio-Temporal Mode Bright Twin-Beam Source Across the Near- and Mid-Infrared |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2605.15385 |