Cooperative Squeezing of Internal and Collective Spins in an Atomic Ensemble

Creating highly spin-squeezed states for quantum metrology surpassing the standard quantum limit is a topic of great interest. Spin squeezing has been achieved by either entangling different atoms in an ensemble, or by controlling the multilevel internal spin state of an atom. Here, we experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with ∼10^{11} rubidium atoms. By synergistically combining these two types of squeezing and carefully aligning their squeezing quadratures, we have achieved a metrologically relevant spin squeezing of -6.21±0.84 dB, significantly outperforming the results obtained by utilizing either type of squeezing alone in our system. Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble.

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Publication Details

Journal
Physical Review Letters
Published
2025-11-20
DOI
https://doi.org/10.1103/xkt1-y58b
Citations
1
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
2.48

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article

Cooperative Squeezing of Internal and Collective Spins in an Atomic Ensemble

Shenchao Jin, Guiying Zhang, Mingfeng Wang, Junlei Duan et al.
1 citations
Physical Review Letters
Quantum Information and Cryptography
2.48
article

Cooperative Squeezing of Internal and Collective Spins in an Atomic Ensemble

Shenchao Jin, Guiying Zhang, Mingfeng Wang, Junlei Duan, Y.N. Zhang, Yanhong Xiao, Klaus Mølmer
article en
1 citations

Abstract

Creating highly spin-squeezed states for quantum metrology surpassing the standard quantum limit is a topic of great interest. Spin squeezing has been achieved by either entangling different atoms in an ensemble, or by controlling the multilevel internal spin state of an atom. Here, we experimentally demonstrate combined internal and collective spin squeezing in a hot atomic ensemble with ∼10^{11} rubidium atoms. By synergistically combining these two types of squeezing and carefully aligning their squeezing quadratures, we have achieved a metrologically relevant spin squeezing of -6.21±0.84 dB, significantly outperforming the results obtained by utilizing either type of squeezing alone in our system. Our approach provides a new perspective on fully harnessing the degrees of freedom inherent in quantum states of an atomic ensemble.

Physical Review LettersVol. 135(21)
University of Copenhagen (DK), Wenzhou University (CN), Fudan University (CN), Shanghai Institute of Optics and Fine Mechanics (CN), Science and Technology on Surface Physics and Chemistry Laboratory (CN), Shanxi University of Traditional Chinese Medicine (CN), University of Chinese Academy of Sciences (CN), Quantum Technologies (Sweden) (SE), State Key Laboratory of Surface Physics, Zhejiang University of Technology (CN)
National Research Foundation, Danmarks Grundforskningsfond, National Natural Science Foundation of China, Science and Technology Commission of Shanghai Municipality, National Science and Technology Major Project, Natural Science Foundation of Zhejiang Province
Openalex Percentile: Top 8%
Quantum Information and Cryptography
2.48
DOIOpen Access PDFOpenAlex
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