标题： 腔介导相互作用的量子气体中准粒子激发的同步 显示英文标题

标题： Synchronization of Quasi-Particle Excitations in a Quantum Gas with Cavity-Mediated Interactions

摘要： 驱动耗散量子系统可以经历从稳态到动态相的转变，这反映了集体非平衡行为的出现。 我们研究了耦合到光学腔中的玻色-爱因斯坦凝聚体中的这种转变，并发展了一种腔辅助布拉格光谱技术来解析其集体模式。 我们在准粒子层面上观察到耗散诱导的同步现象，在例外点处两个类似声子的模式合并。 这揭示了耗散如何在微观上驱动集体动力学，并标志着动态相变的前兆。 显示英文摘要

摘要： Driven-dissipative quantum systems can undergo transitions from stationary to dynamical phases, reflecting the emergence of collective non-equilibrium behavior. We study such a transition in a Bose-Einstein condensate coupled to an optical cavity and develop a cavity-assisted Bragg spectroscopy technique to resolve its collective modes. We observe dissipation-induced synchronization at the quasiparticle level, where two roton-like modes coalesce at an exceptional point. This reveals how dissipation microscopically drives collective dynamics and signals a precursor to a dynamical phase transition.