Minutes-scale Schr{ö}dinger-cat state of spin-5/2 atoms
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866918087995949056 |
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| author | Yang, Y. A. Luo, W. -T. Zhang, J. -L. Wang, S. -Z. Zou, Chang-Ling Xia, T. Lu, Z. -T. |
| author_facet | Yang, Y. A. Luo, W. -T. Zhang, J. -L. Wang, S. -Z. Zou, Chang-Ling Xia, T. Lu, Z. -T. |
| contents | Quantum metrology with nonclassical states offers a promising route to improved precision in physical measurements. The quantum effects of Schr{ö}dinger-cat superpositions or entanglements allow measurement uncertainties to reach below the standard quantum limit. However, the challenge in keeping a long coherence time for such nonclassical states often prevents full exploitation of the quantum advantage in metrology. Here we demonstrate a long-lived Schr{ö}dinger-cat state of optically trapped $^{173}$Yb (\textit{I}\ =\ 5/2) atoms. The cat state, a superposition of two oppositely-directed and furthest-apart spin states, is generated by a non-linear spin rotation. Protected in a decoherence-free subspace against inhomogeneous light shifts of an optical lattice, the cat state achieves a coherence time of $1.4(1)\times 10^3$ s. A magnetic field is measured with Ramsey interferometry, demonstrating a scheme of Heisenberg-limited metrology for atomic magnetometry, quantum information processing, and searching for new physics beyond the Standard Model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_09331 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Minutes-scale Schr{ö}dinger-cat state of spin-5/2 atoms Yang, Y. A. Luo, W. -T. Zhang, J. -L. Wang, S. -Z. Zou, Chang-Ling Xia, T. Lu, Z. -T. Quantum Physics Atomic Physics Quantum metrology with nonclassical states offers a promising route to improved precision in physical measurements. The quantum effects of Schr{ö}dinger-cat superpositions or entanglements allow measurement uncertainties to reach below the standard quantum limit. However, the challenge in keeping a long coherence time for such nonclassical states often prevents full exploitation of the quantum advantage in metrology. Here we demonstrate a long-lived Schr{ö}dinger-cat state of optically trapped $^{173}$Yb (\textit{I}\ =\ 5/2) atoms. The cat state, a superposition of two oppositely-directed and furthest-apart spin states, is generated by a non-linear spin rotation. Protected in a decoherence-free subspace against inhomogeneous light shifts of an optical lattice, the cat state achieves a coherence time of $1.4(1)\times 10^3$ s. A magnetic field is measured with Ramsey interferometry, demonstrating a scheme of Heisenberg-limited metrology for atomic magnetometry, quantum information processing, and searching for new physics beyond the Standard Model. |
| title | Minutes-scale Schr{ö}dinger-cat state of spin-5/2 atoms |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2410.09331 |