Gain-induced spectral non-degeneracy in type-II parametric down-conversion
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914374437830656 |
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| author | Taheri, Behnood Kopylov, Denis Hammer, Manfred Meier, Torsten Förstner, Jens Sharapova, Polina |
| author_facet | Taheri, Behnood Kopylov, Denis Hammer, Manfred Meier, Torsten Förstner, Jens Sharapova, Polina |
| contents | We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to non-degenerate PDC with increasing parametric gain. This effect, originating from the second-order dispersion terms, significantly alters the properties of PDC in the high-gain regime, where it leads to increased distinguishability of the generated photon pairs. The effect is established by evaluating a rigorous theoretical model, which is based on solving a system of coupled integro-differential equations for monochromatic operators. The widely used spatially-averaged approximate model fails to reproduce this important effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_01656 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gain-induced spectral non-degeneracy in type-II parametric down-conversion Taheri, Behnood Kopylov, Denis Hammer, Manfred Meier, Torsten Förstner, Jens Sharapova, Polina Quantum Physics We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to non-degenerate PDC with increasing parametric gain. This effect, originating from the second-order dispersion terms, significantly alters the properties of PDC in the high-gain regime, where it leads to increased distinguishability of the generated photon pairs. The effect is established by evaluating a rigorous theoretical model, which is based on solving a system of coupled integro-differential equations for monochromatic operators. The widely used spatially-averaged approximate model fails to reproduce this important effect. |
| title | Gain-induced spectral non-degeneracy in type-II parametric down-conversion |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.01656 |