论文标题
观察与新兴猫状态的上级相过渡
Observation of a superradiant phase transition with emergent cat states
论文作者
论文摘要
超级相变（SPT）对于理解量子水平上的光 - 物质相互作用非常重要，并且在临界性增强量子传感中起着核心作用。到目前为止，已经在驱动的驱动系统中观察到SPT，但是由于存在强散发，新兴的光场未显示出任何非经典特征。在这里，我们报告了SPT的实验证明，其出现了高度非经典的光子场，并以谐振器耦合到超导量子量轴，并实现了量子性Rabi模型。我们通过Wigner矩阵断层扫描充分表征了轻质状态。测得的矩阵元件表现出光子介质叠加的量子干扰固有，并揭示了轻质的纠缠
Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level, and play a central role in criticality-enhanced quantum sensing. So far, SPTs have been observed in driven-dissipative systems, but the emergent light fields did not show any nonclassical characteristic due to the presence of strong dissipation. Here we report an experimental demonstration of the SPT featuring the emergence of a highly nonclassical photonic field, realized with a resonator coupled to a superconducting qubit, implementing the quantum Rabi model. We fully characterize the light-matter state by Wigner matrix tomography. The measured matrix elements exhibit quantum interference intrinsic of a photonic mesoscopic superposition, and reveal light-matter entanglement
