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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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
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cited_by cdi_FETCH-LOGICAL-c360t-a6f2d0cbe6adf1516d4fd19a11134f81d16b664727b894daa9cb3a62b394a80e3
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container_title PRX quantum
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creator Huang, Meng-Zi
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description 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.
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title Observing Spin-Squeezed States under Spin-Exchange Collisions for a Second
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