论文标题
在宏观自旋系统中对单磁量的量子控制
Quantum control of a single magnon in a macroscopic spin system
论文作者
论文摘要
非古典量子状态是量子系统的关键特征，与其经典的量子系统不同。但是，宏观自旋系统中量子状态的产生和相干控制仍然是一个突出的挑战。在这里，我们通过实验证明了宏观自旋系统（即1〜mm直径的Yttrium-Iron-garnet球体）中单个磁氧的量子对照，并通过微波腔耦合到超导值。通过通过Autler-Townes效应调整量子频率{\ IT}，我们操纵了该单一磁杆以生成其非经典量子状态，包括单麦语状状态和单个磁杆和真空吸尘器的叠加状态。此外，我们通过Wigner断层扫描证实了这些非古典状态的确定性产生。我们的实验在宏观旋转系统中提供了第一个报道的非经典量子状态的确定性生成，并铺平了一种探索其在量子工程中有希望的应用的方法。
Non-classical quantum states are the pivotal features of a quantum system that differs from its classical counterpart. However, the generation and coherent control of quantum states in a macroscopic spin system remain an outstanding challenge. Here we experimentally demonstrate the quantum control of a single magnon in a macroscopic spin system (i.e., 1~mm-diameter yttrium-iron-garnet sphere) coupled to a superconducting qubit via a microwave cavity. By tuning the qubit frequency {\it in situ} via the Autler-Townes effect, we manipulate this single magnon to generate its non-classical quantum states, including the single-magnon state and the superposition state of a single magnon and vacuum. Moreover, we confirm the deterministic generation of these non-classical states by Wigner tomography. Our experiment offers the first reported deterministic generation of the non-classical quantum states in a macroscopic spin system and paves a way to explore its promising applications in quantum engineering.
