Emission of Spin-Correlated Matter-Wave Jets from Spinor Bose-Einstein Condensates,Physical Review Letters

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Emission of Spin-Correlated Matter-Wave Jets from Spinor Bose-Einstein Condensates
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-22 , DOI: 10.1103/physrevlett.127.043401
Kyungtae Kim ₁ , Junhyeok Hur ₁ , SeungJung Huh ₁ , Soonwon Choi _{2,

3} , Jae-Yoon Choi ₁

Affiliation

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 ⟩

and

| F = 1, m_{F} = - 1 ⟩

spin states are generated from

| F = 1, m_{F} = 0 ⟩

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} = \pm 1 ⟩

) 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- and intraspin-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. Our Letter paves the way to generating macroscopic quantum entanglement with the spin and motional degree of freedom with massive particles. It has a wide range of applications from quantum information science to the fundamental studies of quantum entanglement.

中文翻译：

自旋玻色-爱因斯坦凝聚体发射自旋相关物质波射流

我们报告了在强铁磁旋量玻色-爱因斯坦凝聚中观察到的物质波射流发射

{}^{7}李

原子。定向原子束

| F = 1, 米_{F} = 1 ⟩

和

| F = 1, 米_{F} = - 1 ⟩

自旋状态产生于

| F = 1, 米_{F} = 0 ⟩

状态冷凝，反之亦然。这是由集体自旋混合散射事件造成的，其中自发产生的具有相反动量的原子对在它们通过凝聚体时促进了额外的自旋混合碰撞。不同自旋态的物质波射流（

| F = 1, 米_{F} = \pm 1 ⟩

) 可以是具有类空间分离的宏观爱因斯坦-波多尔斯基-罗森态。通过使用每个自旋状态的角相关函数来研究其自旋动量相关性。旋转自旋轴，自旋间和自旋内动量相关峰显示出高对比度振荡，表明原子系综的集体相干性。我们提供数值计算，在定量水平上描述实验结果。我们的信为利用大质量粒子的自旋和运动自由度产生宏观量子纠缠铺平了道路。它具有广泛的应用，从量子信息科学到量子纠缠的基础研究。

更新日期：2021-07-22

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