反铁磁磁子对的腔增强光学操纵

Tahereh Sadat Parvini, Anna-Luisa E. Romling, Sanchar Sharma, Silvia Viola Kusminskiy
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摘要

对反铁磁体(AFMs)中的磁子态进行光学操纵,对于推进基于 AFM 的计算设备具有重大潜力。特别是,已知双磁子拉曼散射过程会产生具有相反力矩的纠缠磁子对。我们建议利用与这些过程耦合的驱动光腔的动态反作用,获得以挤压佩列洛莫夫相干态为代表的挤压磁子对的稳态。系统的动态可由光驱动的强度和调谐以及腔损耗来控制。在快速(或有损耗)腔体的限制下,我们得到了一个有效的佩列洛莫夫运动方程,即光诱导的频移和集体诱导的耗散,其符号可由驱动器的失谐来控制。在红色失谐体系中,临界功率阈值定义了一个磁对算子表现出挤压的区域,这是量子信息的一种资源,以不同的吸引点为标志。超过这个临界点,系统就会演化成磁子对的极限循环。相反,在共振和蓝色失谐状态下,磁子对动力学在低泵功率和高泵功率时分别表现出极限循环和混沌阶段。在该平台中观察到强挤压态、自动振荡极限循环和混沌,为未来的量子信息处理、通信开发和材料研究提供了大有可为的机会。
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Cavity-Enhanced Optical Manipulation of Antiferromagnetic Magnon-Pairs
The optical manipulation of magnon states in antiferromagnets (AFMs) holds significant potential for advancing AFM-based computing devices. In particular, two-magnon Raman scattering processes are known to generate entangled magnon-pairs with opposite momenta. We propose to harness the dynamical backaction of a driven optical cavity coupled to these processes, to obtain steady states of squeezed magnon-pairs, represented by squeezed Perelomov coherent states. The system's dynamics can be controlled by the strength and detuning of the optical drive and by the cavity losses. In the limit of a fast (or lossy) cavity, we obtain an effective equation of motion in the Perelomov representation, in terms of a light-induced frequency shift and a collective induced dissipation which sign can be controlled by the detuning of the drive. In the red-detuned regime, a critical power threshold defines a region where magnon-pair operators exhibit squeezing, a resource for quantum information, marked by distinct attractor points. Beyond this threshold, the system evolves to limit cycles of magnon-pairs. In contrast, for resonant and blue detuning regimes, the magnon-pair dynamics exhibit limit cycles and chaotic phases, respectively, for low and high pump powers. Observing strongly squeezed states, auto-oscillating limit cycles, and chaos in this platform presents promising opportunities for future quantum information processing, communication developments, and materials studies.
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