Interplay of Quantum Resources in Nonlocality Tests
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866908745075785728 |
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| author | Dong, Hai-Hao Zhu, Yuwei Cheng, Su-Yi Zhang, Xingjian Li, Cheng-Long Li, Ying-Zhao Li, Hao You, Lixing Ma, Xiongfeng Zhang, Qiang Pan, Jian-Wei |
| author_facet | Dong, Hai-Hao Zhu, Yuwei Cheng, Su-Yi Zhang, Xingjian Li, Cheng-Long Li, Ying-Zhao Li, Hao You, Lixing Ma, Xiongfeng Zhang, Qiang Pan, Jian-Wei |
| contents | Nonlocality, evidenced by the violation of Bell inequalities, not only signifies entanglement but also highlights measurement incompatibility in quantum systems. Utilizing the generalized Clauser-Horne-Shimony-Holt (CHSH) Bell inequality, our high-efficiency optical setup achieves a loophole-free violation of $2.0132$. This result provides a device-independent lower bound on entanglement, quantified as the entanglement of formation at $0.0159$. Moreover, by tuning the parameters of the generalized Bell inequality, we enhance the estimation of measurement incompatibility, which is quantified by an effective overlap of $4.3883 \times 10^{-5}$. To explore the intricate interplay among nonlocality, entanglement, and measurement incompatibility, we generate mixed states, allowing for flexible modulation of entanglement via fast switching among the four Bell states using Pockels cells, achieving a fidelity above $99.10\%$. Intriguingly, our results reveal a counterintuitive relationship where increasing incompatibility initially boosts nonlocality but eventually leads to its reduction. Typically, maximal nonlocality does not coincide with maximal incompatibility. This experimental study sheds light on the optimal management of quantum resources for Bell-inequality-based quantum information processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_10489 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Interplay of Quantum Resources in Nonlocality Tests Dong, Hai-Hao Zhu, Yuwei Cheng, Su-Yi Zhang, Xingjian Li, Cheng-Long Li, Ying-Zhao Li, Hao You, Lixing Ma, Xiongfeng Zhang, Qiang Pan, Jian-Wei Quantum Physics Nonlocality, evidenced by the violation of Bell inequalities, not only signifies entanglement but also highlights measurement incompatibility in quantum systems. Utilizing the generalized Clauser-Horne-Shimony-Holt (CHSH) Bell inequality, our high-efficiency optical setup achieves a loophole-free violation of $2.0132$. This result provides a device-independent lower bound on entanglement, quantified as the entanglement of formation at $0.0159$. Moreover, by tuning the parameters of the generalized Bell inequality, we enhance the estimation of measurement incompatibility, which is quantified by an effective overlap of $4.3883 \times 10^{-5}$. To explore the intricate interplay among nonlocality, entanglement, and measurement incompatibility, we generate mixed states, allowing for flexible modulation of entanglement via fast switching among the four Bell states using Pockels cells, achieving a fidelity above $99.10\%$. Intriguingly, our results reveal a counterintuitive relationship where increasing incompatibility initially boosts nonlocality but eventually leads to its reduction. Typically, maximal nonlocality does not coincide with maximal incompatibility. This experimental study sheds light on the optimal management of quantum resources for Bell-inequality-based quantum information processing. |
| title | Interplay of Quantum Resources in Nonlocality Tests |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2408.10489 |