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 time scales up to 1 s. The spin degree of freedom remains squeezed after 0.6 s, which is consistent with the limit impose...

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Bibliographic Details
Published in:PRX quantum 2023-05, Vol.4 (2), p.020322, Article 020322
Main Authors: Huang, Meng-Zi, de la Paz, Jose Alberto, Mazzoni, Tommaso, Ott, Konstantin, Rosenbusch, Peter, Sinatra, Alice, Garrido Alzar, Carlos L., Reichel, Jakob
Format: Article
Language:English
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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 time scales 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:2691-3399
2691-3399
DOI:10.1103/PRXQuantum.4.020322