SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 33: Quantum Gases: Bosons IV

Q 33.3: Talk

Wednesday, March 8, 2023, 15:00–15:15, A320

Optimal preparation of spin squeezed states with one-dimensional Bose-Einstein Condensates — •Tiantian Zhang, Mira Maiwöger, Filippo Borselli, Yevhenii Kuriatnikov, Jörg Schmiedmayer, and Maximilian Prüfer — Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien.

Rubidium Bose-Einstein Condensates (BECs) in double wells is spin squeezed in their ground state. However, direct preparation of two condensates is limited by thermal noise in the relative degree of freedom. We circumvent this on our experiment by spatially split a single one-dimensional condensate into two using radio-frequency dressing along the transverse direction of the trap with an Atom Chip. Our single-atom-sensitive fluorescence imaging system makes the sub-shot-noise detection of the number imbalance possible. We present a simple yet effective short-cut to adiabatic splitting. It exploits tunnelling dynamics in the Bosonic Josephson Junction. We have not only observed experimentally an overall enhanced number squeezing compared to direct splitting to a decoupled trap, but also directly measured the oscillation of the number squeezing. The oscillation frequencies scale with the plasma frequencies and have been measured across two orders of magnitude. We can further improve the efficiency by implementing a splitting quench. This enforces squeezing with the trap frequency which is a few times above the experimentally accessible plasma frequencies.