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arXiv quant-ph/0607171quant-ph
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轨道为Angular Momentum的光子对原子的量子转动

Quantized Rotation of Atoms From Photons with Orbital Angular Momentum

M. F. Andersen, C. Ryu, Pierre Clade, V. Natarajan, A. Vaziri, K. Helmerson, W. D. Phillips

摘要:

利用拉盖尔-高斯光束的双光子受激喇曼过程,在钠原子的玻色-爱因斯坦凝聚体中产生原子涡旋态,证明了光子的轨道角动量到原子的相干转移.我们表明,该过程是相干的,通过创建不同的涡旋态的叠加,其中状态之间的相对相位是由光场的相对相位确定的。此外,我们通过向每个原子转移两个光子的轨道角动量来创建电荷2的涡旋。

英文摘要:

We demonstrate the coherent transfer of the orbital angular momentum of a photon to an atom in quantized units of hbar, using a 2-photon stimulated Raman process with Laguerre-Gaussian beams to generate an atomic vortex state in a Bose-Einstein condensate of sodium atoms. We show that the process is coherent by creating superpositions of different vortex states, where the relative phase between the states is determined by the relative phases of the optical fields. Furthermore, we create vortices of charge 2 by transferring to each atom the orbital angular momentum of two photons.

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