标题： 非互易性通过量子非线性实现 显示英文标题

标题： Nonreciprocity realized with quantum nonlinearity

摘要： 非互易器件是信号路由和噪声隔离的关键元件。 量子技术的快速发展推动了对新一代小型化和低损耗非互易组件的需求。 在这里，我们使用一对可调谐的超导人工原子在1D波导中实验实现了最小的无源非互易器件。 利用人工原子的量子非线性行为，我们在广泛功率范围内实现了通过波导的非互易传输。 我们的结果与理论模型一致，表明非互易性与两个量子比特的非局域纠缠准暗态的占据有关，该态对来自相反方向的入射场响应不对称。 我们的实验突显了量子关联在实现非互易行为中的作用，并为构建无需磁场的无源量子非互易器件开辟了一条道路。 显示英文摘要

摘要： Nonreciprocal devices are a key element for signal routing and noise isolation. Rapid development of quantum technologies has boosted the demand for a new generation of miniaturized and low-loss nonreciprocal components. Here we use a pair of tunable superconducting artificial atoms in a 1D waveguide to experimentally realize a minimal passive nonreciprocal device. Taking advantage of the quantum nonlinear behavior of artificial atoms, we achieve nonreciprocal transmission through the waveguide in a wide range of powers. Our results are consistent with theoretical modeling showing that nonreciprocity is associated with the population of the two-qubit nonlocal entangled quasi-dark state, which responds asymmetrically to incident fields from opposing directions. Our experiment highlights the role of quantum correlations in enabling nonreciprocal behavior and opens a path to building passive quantum nonreciprocal devices without magnetic fields.