标题： 量子van der Pol振子的实验实现与同步化 显示英文标题

标题： Experimental realization and synchronization of a quantum van der Pol oscillator

摘要： 经典自维持振荡器，即在没有周期性外部强迫的情况下产生周期性运动的振荡器，在科学和技术中无处不在。 实现非经典自振荡器是量子物理的重要目标。 我们在这里展示了利用单个囚禁原子实现量子范德波尔振荡器的实验，这是一种具有非线性阻尼的经典自治量子驱动耗散系统。 我们在没有驱动的情况下证明了相空间中存在量子极限环，并且在外场驱动非线性振荡器时观察到量子同步现象。 此外，我们还表明，通过使用与驱动方向垂直的压缩态以及出乎意料地利用线性耗散，可以增强同步。 我们还观察到，对于大的压缩态，系统会出现双稳态相空间分布的分岔。 我们的研究结果为探索自维持量子振荡器及其在量子技术中的应用铺平了道路。 显示英文摘要

摘要： Classical self-sustained oscillators, that generate periodic motion without periodic external forcing, are ubiquitous in science and technology. The realization of nonclassical self-oscillators is an important goal of quantum physics. We here present the experimental implementation of a quantum van der Pol oscillator, a paradigmatic autonomous quantum driven-dissipative system with nonlinear damping, using a single trapped atom. We demonstrate the existence of a quantum limit cycle in phase space in the absence of a drive and the occurrence of quantum synchronization when the nonlinear oscillator is externally driven. We additionally show that synchronization can be enhanced with the help of squeezing perpendicular to the direction of the drive and, counterintuitively, linear dissipation. We also observe the bifurcation to a bistable phase-space distribution for large squeezing. Our results pave the way for the exploration of self-sustained quantum oscillators and their application to quantum technology.