Enhancing collective spin squeezing via one-axis twisting echo control of individual atoms

• URL: http://arxiv.org/abs/2602.14036v1
• Date: Sun, 15 Feb 2026 07:54:09 GMT
• Title: Enhancing collective spin squeezing via one-axis twisting echo control of individual atoms
• Authors: Zhiwei Hu, Youwei Zhang, Junlei Duan, Mingfeng Wang, Yanhong Xiao,
• Abstract summary: Existing schemes that harness internal atomic degrees of freedom to boost squeezing typically encode the collective squeezing in complex superpositions of magnetic sublevels.<n>Here, we propose a coherent control scheme that simultaneously enhances collective spin squeezing and maps the resulting atom-atom entanglement onto two well-defined magnetic sublevels.<n>Our results offer a straightforward and efficient strategy for generating highly entangled yet readily accessible quantum states in multilevel atomic systems.
• Score: 5.289304400372572
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Spin squeezing generated via inter-atom entanglement in multilevel atomic ensembles provides a powerful resource for quantum-enhanced metrology. Existing schemes that harness internal atomic degrees of freedom to boost squeezing typically encode the collective squeezing in complex superpositions of magnetic sublevels, which complicates state control and limits practical applications. Here, we propose a coherent control scheme that simultaneously enhances collective spin squeezing and maps the resulting atom-atom entanglement onto two well-defined magnetic sublevels suitable for subsequent metrology experiments. Our protocol sandwiches a quantum non-demolition measurement between two internal one-axis-twisting interactions arranged in an echo sequence. We show that this approach can optimally leverage internal states to boost the inter-atom entanglement and, at the same time, encode it in two magnetic sublevels, which is readily convertible into metrologically useful spin squeezing. Our results offer a straightforward and efficient strategy for generating highly entangled yet readily accessible quantum states in multilevel atomic systems.

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