Chen Yun, Wang Jinwen, Wang Chengyuan, Zhang Shougang, Cao Mingtao, Franke-Arnold Sonja, Gao Hong, Li Fuli
Opt Express. 2021 Sep 27;29(20):31582-31593. doi: 10.1364/OE.439716.
We experimentally investigate the optical storage of perfect optical vortex (POV) and spatially multimode perfect optical vortex (MPOV) beams via electromagnetically induced transparency (EIT) in a hot vapor cell. In particular, we study the role that phase gradients and phase singularities play in reducing the blurring of the retrieved images due to atomic diffusion. Three kinds of manifestations are enumerated to demonstrate such effect. Firstly, the suppression of the ring width broadening is more prominent for POVs with larger orbital angular momentum (OAM). Secondly, the retrieved double-ring MPOV beams' profiles present regular dark singularity distributions that are related to their vortex charge difference. Thirdly, the storage fidelities of the triple-ring MPOVs are substantially improved by designing line phase singularities between multi-ring MPOVs with the same OAM number but π offset phases between adjacent rings. Our experimental demonstration of MPOV storage opens new opportunities for increasing data capacity in quantum memories by spatial multiplexing, as well as the generation and manipulation of complex optical vortex arrays.
我们通过热蒸汽池中电磁诱导透明（EIT）效应，对完美光学涡旋（POV）光束和空间多模完美光学涡旋（MPOV）光束的光存储进行了实验研究。特别地，我们研究了相位梯度和相位奇点在减少由于原子扩散导致的检索图像模糊方面所起的作用。列举了三种表现形式来证明这种效应。首先，对于具有较大轨道角动量（OAM）的POV，其环宽展宽的抑制更为显著。其次，检索到的双环MPOV光束的轮廓呈现出规则的暗奇点分布，这与它们的涡旋电荷差有关。第三，通过在具有相同OAM数但相邻环之间具有π相位偏移的多环MPOV之间设计线相位奇点，三环MPOV的存储保真度得到了显著提高。我们对MPOV存储的实验演示为通过空间复用增加量子存储器中的数据容量，以及复杂光学涡旋阵列的产生和操纵开辟了新的机会。
