Observing spin-squeezed states under spin-exchange collisions for a second

Using the platform of a trapped-atom clock on a chip, we observe the time evolution of spin-squeezed hyperfine clock states in ultracold rubidium atoms on previously inaccessible timescales up to 1 s. The spin degree-of-freedom remains squeezed after 0.6 s, which is consistent with the limit imposed...

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Bibliographic Details
Published in:arXiv.org 2023-05
Main Authors: Meng-Zi Huang, Jose Alberto de la Paz, Mazzoni, Tommaso, Ott, Konstantin, Rosenbusch, Peter, Sinatra, Alice, Garrido Alzar, Carlos L, Reichel, Jakob
Format: Article
Language:English
Subjects:
Amplification
Atomic clocks
Compressing
Metrology
Particle spin
Quantum nondemolition
Spin dynamics
Squeezed states (quantum theory)
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Summary:Using the platform of a trapped-atom clock on a chip, we observe the time evolution of spin-squeezed hyperfine clock states in ultracold rubidium atoms on previously inaccessible timescales up to 1 s. The spin degree-of-freedom remains squeezed after 0.6 s, which is consistent with the limit imposed by particle loss and is compatible with typical Ramsey times in state-of-the-art microwave clocks. The results also reveal a surprising spin-exchange interaction effect that amplifies the cavity-based spin measurement via a correlation between spin and external degrees of freedom. These results open up perspectives for squeezing-enhanced atomic clocks in a metrologically relevant regime and highlight the importance of spin interactions in real-life applications of spin squeezing.
ISSN:2331-8422
DOI:10.48550/arxiv.2007.01964