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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2306.09677 |
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| _version_ | 1866914749812310016 |
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| author | Xu, Da Gu, Xu-Ke Weng, Yuan-Chao Li, He-Kang Wang, Yi-Pu Zhu, Shi-Yao You, J. Q. |
| author_facet | Xu, Da Gu, Xu-Ke Weng, Yuan-Chao Li, He-Kang Wang, Yi-Pu Zhu, Shi-Yao You, J. Q. |
| contents | Entanglement is a fundamental property in quantum mechanics that systems share inseparable quantum correlation regardless of their mutual distances. Owing to the fundamental significance and versatile applications, the generation of quantum entanglement between {\it macroscopic} systems has been a focus of current research. Here we report on the deterministic generation and tomography of the macroscopically entangled Bell state in a hybrid quantum system containing a millimeter-sized spin system ($\sim 1\times10^{19}$ atoms) and a micrometer-sized superconducting qubit. The deterministic generation is realized by coupling the macroscopic spin system and the qubit via a microwave cavity. Also, we develop a joint tomography approach to confirming the deterministic generation of the Bell state, which gives a generation fidelity of $0.90\pm0.01$. Our work makes the macroscopic spin system the {\it largest} system (in the sense of atom number) capable of generating the maximally entangled quantum state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_09677 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Macroscopic Bell state between a millimeter-sized spin system and a superconducting qubit Xu, Da Gu, Xu-Ke Weng, Yuan-Chao Li, He-Kang Wang, Yi-Pu Zhu, Shi-Yao You, J. Q. Quantum Physics Entanglement is a fundamental property in quantum mechanics that systems share inseparable quantum correlation regardless of their mutual distances. Owing to the fundamental significance and versatile applications, the generation of quantum entanglement between {\it macroscopic} systems has been a focus of current research. Here we report on the deterministic generation and tomography of the macroscopically entangled Bell state in a hybrid quantum system containing a millimeter-sized spin system ($\sim 1\times10^{19}$ atoms) and a micrometer-sized superconducting qubit. The deterministic generation is realized by coupling the macroscopic spin system and the qubit via a microwave cavity. Also, we develop a joint tomography approach to confirming the deterministic generation of the Bell state, which gives a generation fidelity of $0.90\pm0.01$. Our work makes the macroscopic spin system the {\it largest} system (in the sense of atom number) capable of generating the maximally entangled quantum state. |
| title | Macroscopic Bell state between a millimeter-sized spin system and a superconducting qubit |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2306.09677 |