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5 March 2021 Long-lived spin-squeezed states in an trapped-atom clock on a chip
Meng-Zi Huang, Jose Alberto de la Paz, Tommaso Mazzoni, Carlos L. Garrido Alzar, Jakob Reichel
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Proceedings Volume 11700, Optical and Quantum Sensing and Precision Metrology; 117000Q (2021) https://doi.org/10.1117/12.2586780
Event: SPIE OPTO, 2021, Online Only
Abstract
Using the platform of a trapped-atom clock on a chip, we have generated spin-squeezed states and observed their time evolution on unprecedented timescales, showing that metrological spin squeezing is preserved for one second. We observe up to 8.1(9) dB of metrological squeezing in a cloud of $2times 10^4$ ultracold alkali atoms by quantum nondemolition (QND) measurement in a fiber Fabry-Perot microcavity. The experiment also reveals a surprising amplification effect in the final cavity measurement of the spin state. It results from a subtle interplay between the cavity coupling and the spin dynamics originating from cold collisions. Spin dynamics such as these are an important factor in real atomic clocks that previous proof-of-principle squeezing experiments had not been able to address. Our results open up encouraging perspectives for squeezing-enhanced atomic clocks in a metrologically relevant stability regime.
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Meng-Zi Huang, Jose Alberto de la Paz, Tommaso Mazzoni, Carlos L. Garrido Alzar, and Jakob Reichel "Long-lived spin-squeezed states in an trapped-atom clock on a chip", Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 117000Q (5 March 2021); https://doi.org/10.1117/12.2586780
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KEYWORDS
Clocks
Metrology
Atomic clocks
Spin dynamics
Chemical species
Clouds
Fabry–Perot interferometers
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