浙江大学刘刚团队研究了通过双磁振子驱动和耗散的空腔-磁振子-量子位系统中的磁振子猫态。相关论文于2025年8月26日发表在《物理评论A》杂志上。

利用双磁子驱动和耗散机制，研究组提出了一种在腔-磁子-量子比特混合系统中耗散产生磁子猫态的有效方法。当同时驱动磁振子和量子比特时，诱导相干非线性双磁振子相互作用，其中量子比特和磁振子模式通过磁振子对交换能量。利用量子比特的耗散来引导磁振子模式进入不同相干态的量子叠加态，其中磁振子模式根据磁振子初始态的宇称演变为偶猫态或奇猫态。

对于磁振子初始态是叠加态的情况，例如，|0和|1 ，磁振子模可以演化为奇偶猫态的加权混合。研究组还发现在短时间演化过程中可能会出现磁振子压缩态，显示了其机制在制备各种磁振子非经典态方面的能力。磁猫态和压缩态是宏观量子态，在宏观量子研究和量子传感中有应用，例如在以铁磁轴子光镜为主题的暗物质搜索中。

附：英文原文

Title: Magnon cat states in a cavity-magnon-qubit system via two-magnon driving and dissipation

Author: Gang Liu, Gen Li, Huatang Tan, Jie Li

Issue&Volume: 2025/08/26

Abstract: We propose an efficient method for dissipative generation of magnonic cat states in a cavity-magnon-qubit hybrid system by exploiting a two-magnon driving and dissipation mechanism. When both the magnon and qubit are driven, a coherent nonlinear two-magnon interaction is induced, wherein the qubit and the magnon mode exchange energy through magnon pairs. The dissipation of the qubit is exploited to steer the magnon mode into a quantum superposition of distinct coherent states, where the magnon mode evolves into either an even or odd cat state, depending on the parity of the magnon initial state. For the case where the magnon initial state is a superposition state, e.g., of |0 and |1, the magnon mode can evolve into a weighted mixture of the even and odd cat states. We also find that magnon squeezed states may emerge during the short-time evolution, showcasing the capability of our mechanism in preparing diverse magnon nonclassical states. Magnonic cat and squeezed states are macroscopic quantum states and have applications in macroscopic quantum studies and quantum sensing, e.g., in the dark-matter search using ferromagnetic axion haloscopes.

DOI: 10.1103/zhgm-p3ss

Source: https://journals.aps.org/pra/abstract/10.1103/zhgm-p3ss