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arXiv · 2102.07613

Emission of Spin-correlated Matter-wave Jets from Spinor Bose-Einstein Condensates

Kyungtae Kim·Junhyeok Hur·SeungJung Huh·Soonwon Choi·Jae-yoon Choi
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Abstract

We report the observation of matter-wave jet emission in a strongly ferromagnetic spinor Bose-Einstein condensate of $^7$Li atoms. Directional atomic beams with $|{F=1,m_F=1}\rangle$ and $|{F=1,m_F=-1}\rangle$ spin states are generated from $|{F=1,m_F=0}\rangle$ state condensates, or vice versa. This results from collective spin-mixing scattering events, where spontaneously produced pairs of atoms with opposite momentum facilitates additional spin-mixing collisions as they pass through the condensates. The matter-wave jets of different spin states ($|{F=1,m_F=\pm1}\rangle$) can be a macroscopic Einstein-Podolsky-Rosen state with spacelike separation. Its spin-momentum correlations are studied by using the angular correlation function for each spin state. Rotating the spin axis, the inter-spin and intra-spin momentum correlation peaks display a high contrast oscillation, indicating collective coherence of the atomic ensembles. We provide numerical calculations that describe the experimental results at a quantitative level and can identify its entanglement after 100~ms of a long time-of-flight.

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Kyungtae Kim, Junhyeok Hur, SeungJung Huh, Soonwon Choi, Jae-yoon Choi. 2021-02-15. Emission of Spin-correlated Matter-wave Jets from Spinor Bose-Einstein Condensates. https://doi.org/10.1103/physrevlett.127.043401

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