Generation of subnatural-linewidth orbital angular momentum entangled biphotons using a single driving laser in hot atoms
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909220811571200 |
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| author | Ma, Jiaheng Wang, Chengyuan Li, Bingbing Chen, Yun Yang, Ye Wang, Jinwen Yang, Xin Qiu, Shuwei Gao, Hong Li, Fuli |
| author_facet | Ma, Jiaheng Wang, Chengyuan Li, Bingbing Chen, Yun Yang, Ye Wang, Jinwen Yang, Xin Qiu, Shuwei Gao, Hong Li, Fuli |
| contents | Orbital angular momentum (OAM) entangled photon pairs with narrow bandwidths play a crucial role in the interaction of light and quantum states of matter. In this article, we demonstrate an approach for generating OAM entangled photon pairs with a narrow bandwidth by using a single driving beam in a $^{85}$Rb atomic vapor cell. This single driving beam is able to simultaneously couple two atomic transitions and directly generate OAM entangled biphotons by leveraging the OAM conservation law through the spontaneous four-wave mixing (SFWM) process. The photon pairs exhibit a maximum cross-correlation function value of 27.7 and a linewidth of 4 MHz. The OAM entanglement is confirmed through quantum state tomography, revealing a fidelity of 95.7\% and a concurrence of 0.926 when compared to the maximally entangled state. Our scheme is notably simpler than previously proposed schemes and represents the first demonstration of generating subnatural-linewidth entangled photon pairs in hot atomic systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_20570 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Generation of subnatural-linewidth orbital angular momentum entangled biphotons using a single driving laser in hot atoms Ma, Jiaheng Wang, Chengyuan Li, Bingbing Chen, Yun Yang, Ye Wang, Jinwen Yang, Xin Qiu, Shuwei Gao, Hong Li, Fuli Quantum Physics Orbital angular momentum (OAM) entangled photon pairs with narrow bandwidths play a crucial role in the interaction of light and quantum states of matter. In this article, we demonstrate an approach for generating OAM entangled photon pairs with a narrow bandwidth by using a single driving beam in a $^{85}$Rb atomic vapor cell. This single driving beam is able to simultaneously couple two atomic transitions and directly generate OAM entangled biphotons by leveraging the OAM conservation law through the spontaneous four-wave mixing (SFWM) process. The photon pairs exhibit a maximum cross-correlation function value of 27.7 and a linewidth of 4 MHz. The OAM entanglement is confirmed through quantum state tomography, revealing a fidelity of 95.7\% and a concurrence of 0.926 when compared to the maximally entangled state. Our scheme is notably simpler than previously proposed schemes and represents the first demonstration of generating subnatural-linewidth entangled photon pairs in hot atomic systems. |
| title | Generation of subnatural-linewidth orbital angular momentum entangled biphotons using a single driving laser in hot atoms |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2405.20570 |