论文标题
在冷原子气体中的湍流 - 相过渡时的信息压缩
Information compression at the turbulent-phase transition in cold atom gases
论文作者
论文摘要
物理系统在热平衡中的统计特性与远距离平衡的对应物明显不同。在后者中，波动通常主导动力学，并可能以耗时相干结构的形式以有序的模式聚类。在这里，我们研究了冷原子云的过渡，该过渡从稳定的阶段驱动到尖锐的电子共振。从原子密度分布（使用空间分辨的泵探针技术测量）中，我们以两个不同的基础组计算了香农熵。在关键时期，已经观察到与香农熵最小值的信息压缩，在该系统中，系统波动组织成高阶（低渗透率）模式。该功能独立于所使用的表示形式，是经过相变的大量物理系统共享的属性。
The statistical properties of physical systems in thermal equilibrium are blatantly different from their far-from-equilibrium counterparts. In the latter, fluctuations often dominate the dynamics and might cluster in ordered patterns in the form of dissipative coherent structures. Here, we study the transition of a cold atomic cloud, driven close to a sharp electronic resonance, from a stable to a turbulent phase. From the atomic density distribution -- measured using a spatially-resolved pump-probe technique -- we have computed the Shannon entropy on two different basis sets. Information compression, corresponding to a minimum in the Shannon entropy, has been observed at criticality, where the system fluctuations organize into high-order (low-entropy) patterns. Being independent of the representation used, this feature is a property shared by a vast class of physical systems undergoing phase transitions.
