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Q: Fachverband Quantenoptik und Photonik

Q 33: Quantum Gases: Bosons IV

Q 33.4: Talk

Wednesday, March 8, 2023, 15:15–15:30, A320

Engineering Correlated Spin-Momentum Pairs in a Quantum Gas Coupled to an Optical Cavity — Fabian Finger, Rodrigo Rosa-Medina, •Nicola Reiter, Panagiotis Christodoulou, Tobias Donner, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland

Quantum correlations among the constituents of many-body systems determine their fundamental properties. Quantum gases with their pristine control over external and internal degrees of freedom offer a versatile platform to manipulate and detect such correlations at a microscopic level. Here, we report on the observation of correlated atomic pairs in specific spin and momentum modes. Our implementation relies on Raman scattering between different spin levels of a spinor Bose-Einstein condensate, which is induced by the interplay of a running-wave transverse laser and the vacuum field of an optical cavity. Far-detuned from Raman resonance, a four-photon process gives rise to collectively-enhanced spin-mixing dynamics. We investigate the statistics of the produced pairs and explore their non-classical character through noise correlations in momentum space. Our results demonstrate a new platform for fast generation of correlated pairs in a quantum gas and provide prospects for matter-wave interferometry using entangled motional states.