Minutes-scale Schr{ö}dinger-cat state of spin-5/2 atoms

• URL: http://arxiv.org/abs/2410.09331v1
• Date: Sat, 12 Oct 2024 02:29:26 GMT
• Title: Minutes-scale Schr{ö}dinger-cat state of spin-5/2 atoms
• Authors: Y. A. Yang, W. -T. Luo, J. -L. Zhang, S. -Z. Wang, Chang-Ling Zou, T. Xia, Z. -T. Lu,
• Abstract summary: We demonstrate a long-lived Schr"odinger-cat state of optically trapped $173$Yb (textitI = 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 $1.4(1)times 103$ s.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum metrology with nonclassical states offers a promising route to improved precision in physical measurements. The quantum effects of Schr{\"o}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{\"o}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.

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