Long−lived spin−squeezed states in an trapped−atom clock on a chip (Invited paper)

We demonstrate spontaneous spin squeezing in a trapped-atom clock on a chip (TACC) using condensed atoms and present progress towards a squeezed clock with thermal atoms, which uses a fiber microcavity on the chip.

Quantum Information and Measurement (QIM)Jan 1, 20170 citations

Long−lived spin−squeezed states in an trapped−atom clock on a chip (Invited paper)

Meng-Zi Huang, José Alberto de la Paz Espinosa, Tommaso Mazzoni, Carlos L. Garrido Alzar, Jakob Reichel

Published Mar 6, 2021• 0 citations

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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.

Using the platform of a trapped-atom clock on a chip, we have generated spin-squeezed states with up to 8.1(9) dB of metrological squeezing in a cloud of

2\times 10^4

ultracold alkali atoms by quantum nondemolition (QND) measurement in a fiber Fabry-Perot microcavity. Observing the time evolution of the squeezed state on unprecedented timescales of more than one second reveals a surprising measurement amplification effect in the final measurement of the spin state. It results from a subtle interplay between the spin dynamics of interacting indistinguishable particles and energy-dependent cavity coupling and leads to an increased cavity shift per spin, and thus to a higher signal per photon read out. Metrological spin squeezing is preserved for 1 s. Both results open up encouraging perspectives for squeezing-enhanced atomic clocks in a metrologically relevant stability regime.