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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.01745 |
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| _version_ | 1866908860283879424 |
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| author | Yang, Yi Wang, Bin Lin, Ji-Chao Gao, Yang Li, Xin Chen, Jiu-Peng Hou, Lei Wang, Ye Wan, Yong Xie, Xiu-Ping Zheng, Ming-Yang Zhang, Qiang Pan, Jian-Wei |
| author_facet | Yang, Yi Wang, Bin Lin, Ji-Chao Gao, Yang Li, Xin Chen, Jiu-Peng Hou, Lei Wang, Ye Wan, Yong Xie, Xiu-Ping Zheng, Ming-Yang Zhang, Qiang Pan, Jian-Wei |
| contents | Quantum frequency conversion (QFC) is essential for bridging the spectral gap between stationary qubits and low-loss optical communication channels. In this work, we demonstrate a short-wavelength-pumping QFC with the first-order quasi-phase matching period of 3.07 um on thin-film lithium niobate, converting ultraviolet photons to the telecom C-band. By constructing a theoretical model that correlates the normalized conversion efficiency with domain defects in the short-period phase-matched waveguide, we found the critical tolerance of domain defects along the waveguide should be $\le 2$ (excluding the ends). Based on this, we achieved a theoretical limit normalized conversion efficiency of 839%/(W*cm^2) for the fundamental guided mode through fabrication optimization. Furthermore, we propose a robust noise suppression strategy for short-wavelength pumping by utilizing the counter-tuning behaviors of difference-frequency generation and spontaneous parametric down-conversion. By combining these advances with ultra-narrowband filtering, we achieve a record-high external efficiency of 28.8% and an ultra-low noise of 35 counts per second. This high-performance QFC connecting ultraviolet and telecom bands satisfies the stringent requirements for long-lived remote ion-ion entanglement in scalable quantum networks [W.-Z. Liu et al., Nature (2026)]. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_01745 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | High-Performance Quantum Frequency Conversion from Ultraviolet to Telecom Band Yang, Yi Wang, Bin Lin, Ji-Chao Gao, Yang Li, Xin Chen, Jiu-Peng Hou, Lei Wang, Ye Wan, Yong Xie, Xiu-Ping Zheng, Ming-Yang Zhang, Qiang Pan, Jian-Wei Quantum Physics Optics Quantum frequency conversion (QFC) is essential for bridging the spectral gap between stationary qubits and low-loss optical communication channels. In this work, we demonstrate a short-wavelength-pumping QFC with the first-order quasi-phase matching period of 3.07 um on thin-film lithium niobate, converting ultraviolet photons to the telecom C-band. By constructing a theoretical model that correlates the normalized conversion efficiency with domain defects in the short-period phase-matched waveguide, we found the critical tolerance of domain defects along the waveguide should be $\le 2$ (excluding the ends). Based on this, we achieved a theoretical limit normalized conversion efficiency of 839%/(W*cm^2) for the fundamental guided mode through fabrication optimization. Furthermore, we propose a robust noise suppression strategy for short-wavelength pumping by utilizing the counter-tuning behaviors of difference-frequency generation and spontaneous parametric down-conversion. By combining these advances with ultra-narrowband filtering, we achieve a record-high external efficiency of 28.8% and an ultra-low noise of 35 counts per second. This high-performance QFC connecting ultraviolet and telecom bands satisfies the stringent requirements for long-lived remote ion-ion entanglement in scalable quantum networks [W.-Z. Liu et al., Nature (2026)]. |
| title | High-Performance Quantum Frequency Conversion from Ultraviolet to Telecom Band |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2603.01745 |