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arXiv · 1804.07536

Spontanous spin squezing in a rubidium BEC

Théo Laudat·Vincent Dugrain·Tommaso Mazzoni·Meng-Zi Huang·Carlos L. Garrido Alzar·Alice Sinatra·Peter Rosenbusch·Jakob Reichel
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Abstract

We describe an experiment where spin squeezing occurs spontaneously within a standard Ramsey sequence driving a two-component Bose-Einstein condensate (BEC) of 87Rb atoms trapped in an elongated magnetic trap. Multiparticle entanglement is generated by state-dependent collisional interactions, despite the near-identical scattering lengths of the spin states in 87Rb. In our proof-of-principle experiment, we observe a metrological spin squeezing that reaches 1.3+/-0.4dB for 5000 atoms, with a contrast of 90+/-1%. The method may be applied to realize spin-squeezed BEC sources for atom interferometry without the need for cavities, state-dependent potentials or Feshbach resonances.

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Théo Laudat, Vincent Dugrain, Tommaso Mazzoni, Meng-Zi Huang, Carlos L. Garrido Alzar, Alice Sinatra, Peter Rosenbusch, Jakob Reichel. 2018-04-20. Spontanous spin squezing in a rubidium BEC. https://doi.org/10.1088/1367-2630/aacf1e

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