论文标题
Bogoliubov激发及其对光线超氟的证据的影响
Interferences between Bogoliubov excitations and their impact on the evidence of superfluidity in a paraxial fluid of light
论文作者
论文摘要
光的近后流体代表了原子玻色菌冷凝水和超流体液体的替代平台，用于研究集体激发的量子行为。朝这个方向朝的关键步骤是Bogoliubov分散关系的精确表征，如两个实验中所示。但是，迄今为止，尚未观察到尚未观察到集体超氟行为的明确标志的声子激发之间的预测干扰。在这里，通过分析，数值和实验探索声子相位速度，我们观察到反向传播的Bogoliubov激发之间存在干扰，并证明了它们对分散关系测量的关键影响。这些结果证明了光超流体的关键特征，并为使用光子的量子模拟提供了一种新颖的表征工具。
Paraxial fluids of light represent an alternative platform to atomic Bose-Einstein condensates and superfluid liquids for the study of the quantum behaviour of collective excitations. A key step in this direction is the precise characterization of the Bogoliubov dispersion relation, as recently shown in two experiments. However, the predicted interferences between the phonon excitations that would be a clear signature of the collective superfluid behaviour have not been observed to date. Here, by analytically, numerically, and experimentally exploring the phonon phase-velocity, we observe the presence of interferences between counter-propagating Bogoliubov excitations and demonstrate their critical impact on the measurement of the dispersion relation. These results are evidence of a key signature of light superfluidity and provide a novel characterization tool for quantum simulations with photons.
