Bell Inequality Violation with Vacuum-One-Photon Number Superposition States
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912718932410368 |
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| author | Zeng, Zi-Qi Wang, Jian Liu, Xiu-Bin Wang, Xu-Jie Liu, Li Liu, Hanqing Ni, Haiqiao Niu, Zhichuan Antón-Solanas, Carlos Wu, Bang Yuan, Zhiliang |
| author_facet | Zeng, Zi-Qi Wang, Jian Liu, Xiu-Bin Wang, Xu-Jie Liu, Li Liu, Hanqing Ni, Haiqiao Niu, Zhichuan Antón-Solanas, Carlos Wu, Bang Yuan, Zhiliang |
| contents | Entanglement is a central resource in quantum technologies, and the realization of photonic entanglement necessarily relies on interaction with matter. Resonance fluorescence (RF), originating from the coherent interaction between a driving field and a two-level system, plays a pivotal role in quantum optics. Here, we demonstrate a novel route to entanglement generation based on RF from a single quantum dot. Rather than relying on generation of multiphoton states, our approach directly exploits vacuum-one-photon number superposition states created under resonant excitation. By delocalizing this superposition via a beam splitter, we realize time-bin entanglement and observe a clear violation of the Clauser-Horn-Shimony-Holt Bell inequality using Franson-type interferometry. Our scheme removes the need for multiphoton generation, simplifies the experimental requirements, and establishes a scalable pathway toward solid-state entangled photon sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_15413 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bell Inequality Violation with Vacuum-One-Photon Number Superposition States Zeng, Zi-Qi Wang, Jian Liu, Xiu-Bin Wang, Xu-Jie Liu, Li Liu, Hanqing Ni, Haiqiao Niu, Zhichuan Antón-Solanas, Carlos Wu, Bang Yuan, Zhiliang Quantum Physics Entanglement is a central resource in quantum technologies, and the realization of photonic entanglement necessarily relies on interaction with matter. Resonance fluorescence (RF), originating from the coherent interaction between a driving field and a two-level system, plays a pivotal role in quantum optics. Here, we demonstrate a novel route to entanglement generation based on RF from a single quantum dot. Rather than relying on generation of multiphoton states, our approach directly exploits vacuum-one-photon number superposition states created under resonant excitation. By delocalizing this superposition via a beam splitter, we realize time-bin entanglement and observe a clear violation of the Clauser-Horn-Shimony-Holt Bell inequality using Franson-type interferometry. Our scheme removes the need for multiphoton generation, simplifies the experimental requirements, and establishes a scalable pathway toward solid-state entangled photon sources. |
| title | Bell Inequality Violation with Vacuum-One-Photon Number Superposition States |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.15413 |