A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918068080345088 |
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| author | Babel, Silia Bollmers, Laura Roeder, Franz Ridder, Werner Golla, Christian Köthemann, Ronja Reineke, Bernhard Herrmann, Harald Brecht, Benjamin Eigner, Christof Padberg, Laura Silberhorn, Christine |
| author_facet | Babel, Silia Bollmers, Laura Roeder, Franz Ridder, Werner Golla, Christian Köthemann, Ronja Reineke, Bernhard Herrmann, Harald Brecht, Benjamin Eigner, Christof Padberg, Laura Silberhorn, Christine |
| contents | We present the design and characterisation of a guided-wave, bright and highly frequency non-degenerate parametric down-conversion source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815$\,\mathrm{nm}$ and 1550$\,\mathrm{nm}$ linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as $g^{(2)}_h(0) = (6.7\pm1.1)\cdot10^{-3}$. Furthermore, we achieve a high spectral brightness of 0.44$\cdot$10$^{7}$$\frac{\text{pairs}}{\text{s} \cdot \text{mW} \cdot \text{GHz}}$ which is two orders of magnitude higher than sources based on weakly guiding waveguides. The almost perfect sinc-shape and the strong agreement between the effective and nominal bandwidth highlights the success of our integrated workflow, which begins with device design and continues through precise fabrication to detailed quantum-state characterization. This comprehensive approach enables targeted optimization of the source, resulting in excellent quantum state generation. Our results set a new standard for on-chip, non-degenerate photon-pair sources and represent a crucial step towards practical, scalable quantum communication networks and photonic quantum computing. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_18609 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths Babel, Silia Bollmers, Laura Roeder, Franz Ridder, Werner Golla, Christian Köthemann, Ronja Reineke, Bernhard Herrmann, Harald Brecht, Benjamin Eigner, Christof Padberg, Laura Silberhorn, Christine Quantum Physics We present the design and characterisation of a guided-wave, bright and highly frequency non-degenerate parametric down-conversion source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815$\,\mathrm{nm}$ and 1550$\,\mathrm{nm}$ linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as $g^{(2)}_h(0) = (6.7\pm1.1)\cdot10^{-3}$. Furthermore, we achieve a high spectral brightness of 0.44$\cdot$10$^{7}$$\frac{\text{pairs}}{\text{s} \cdot \text{mW} \cdot \text{GHz}}$ which is two orders of magnitude higher than sources based on weakly guiding waveguides. The almost perfect sinc-shape and the strong agreement between the effective and nominal bandwidth highlights the success of our integrated workflow, which begins with device design and continues through precise fabrication to detailed quantum-state characterization. This comprehensive approach enables targeted optimization of the source, resulting in excellent quantum state generation. Our results set a new standard for on-chip, non-degenerate photon-pair sources and represent a crucial step towards practical, scalable quantum communication networks and photonic quantum computing. |
| title | A ultrabright, two-colour photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.18609 |