1. Observing Spin-Squeezed States under Spin-Exchange Collisions for a Second
- Author
-
Meng-Zi Huang, Jose Alberto de la Paz, Tommaso Mazzoni, Konstantin Ott, Peter Rosenbusch, Alice Sinatra, Carlos L. Garrido Alzar, and Jakob Reichel
- Subjects
Condensed Matter::Quantum Gases ,Quantum Physics ,General Computer Science ,Applied Mathematics ,FOS: Physical sciences ,Physics::Optics ,General Physics and Astronomy ,Physics::Atomic Physics ,Electrical and Electronic Engineering ,Quantum Physics (quant-ph) ,Mathematical Physics ,Electronic, Optical and Magnetic Materials - Abstract
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., 12 pages, 6 figures
- Published
- 2023