Polarization-entangled quantum frequency comb from a silicon nitride microring resonator
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arXiv
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| Format: | Preprint |
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2023
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| author | Wen, Wenjun Yan, Wenhan Lu, Chi Lu, Liangliang Wu, Xiaoyu Lu, Yanqing Zhu, Shining Ma, Xiao-song |
| author_facet | Wen, Wenjun Yan, Wenhan Lu, Chi Lu, Liangliang Wu, Xiaoyu Lu, Yanqing Zhu, Shining Ma, Xiao-song |
| contents | Integrated microresonator facilitates the realization of quantum frequency comb (QFC), which provides a large number of discrete frequency modes with broadband spectral range and narrow linewidth. However, all previous demonstrations have focused on the generation of energy-time or time-bin entangled photons from QFC. Realizing polarization-entangled quantum frequency comb, which is the important resource for fundamental study of quantum mechanics and quantum information applications, remains challenging. Here, we demonstrate, for the first time, a broadband polarization-entangled quantum frequency comb by combining an integrated silicon nitride micro-resonator with a Sagnac interferometer. With a free spectral range of about 99 GHz and a narrow linewidth of about 190 MHz, our source provides 22 polarization entangled photons pairs with frequency covering the whole telecom C-band. The entanglement fidelities for all 22 pairs are above 81%, including 17 pairs with fidelities higher than 90%. Our demonstration paves the way for employing the polarization-entangled quantum frequency comb in quantum network using CMOS technology as well as standard dense wavelength division multiplexing technology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_01181 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Polarization-entangled quantum frequency comb from a silicon nitride microring resonator Wen, Wenjun Yan, Wenhan Lu, Chi Lu, Liangliang Wu, Xiaoyu Lu, Yanqing Zhu, Shining Ma, Xiao-song Quantum Physics Optics Integrated microresonator facilitates the realization of quantum frequency comb (QFC), which provides a large number of discrete frequency modes with broadband spectral range and narrow linewidth. However, all previous demonstrations have focused on the generation of energy-time or time-bin entangled photons from QFC. Realizing polarization-entangled quantum frequency comb, which is the important resource for fundamental study of quantum mechanics and quantum information applications, remains challenging. Here, we demonstrate, for the first time, a broadband polarization-entangled quantum frequency comb by combining an integrated silicon nitride micro-resonator with a Sagnac interferometer. With a free spectral range of about 99 GHz and a narrow linewidth of about 190 MHz, our source provides 22 polarization entangled photons pairs with frequency covering the whole telecom C-band. The entanglement fidelities for all 22 pairs are above 81%, including 17 pairs with fidelities higher than 90%. Our demonstration paves the way for employing the polarization-entangled quantum frequency comb in quantum network using CMOS technology as well as standard dense wavelength division multiplexing technology. |
| title | Polarization-entangled quantum frequency comb from a silicon nitride microring resonator |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2309.01181 |