近日，华中科技大学的吕新友教授及其研究团队研究了间接拉比相互作用诱导的超辐射相变。相关成果已于2023年3月3日在国际权威学术期刊《物理评论A》上发表。
该研究团队从理论上研究了间接拉比模型中的超辐射相变(SPT)，该模型包括两能级系统和单模玻色子场与一个辅助玻色子场的耦合。研究人员发现，通过辅助场的虚激发，间接自旋场耦合可以在临界点处发生SPT，且正常拉比模型中的A2项的影响被自然地避免。在大失谐区域，研究人员给出了量子临界点的解析表达式，用原始系统参数表示。临界原子场耦合强度是可调的，这将放宽实现SPT的条件。
考虑到一个磁子-腔-量子比特混合系统，研究人员使用可行的实验参数预测了产生的磁子压缩猫态，这在量子计量和量子信息处理中具有潜在的应用价值。
附：英文原文
Title: Superradiant phase transition induced by the indirect Rabi interaction
Author: Wen Huang, Ying Wu, Xin-You Lü
Issue&Volume: 2023/03/03
Abstract: We theoretically study the superradiant phase transition (SPT) in an indirect Rabi model, where both a two-level system and a single-mode bosonic field couple to an auxiliary bosonic field. We find that the indirect spin-field coupling induced by the virtual excitation of the auxiliary field can allow the occurrence of a SPT at a critical point, and the influence of the so-called A2 term in the normal Rabi model is naturally avoided. In the large detuning regime, we present the analytical expression of quantum critical point in terms of the original system parameters. The critical atom-field coupling strength is tunable, which will loosen the conditions on realizing the SPT. Considering a hybrid magnon-cavity-qubit system, we predict the squeezed cat state of magnon generated with feasible experimental parameters, which has potential applications in quantum metrology and quantum information processing.
DOI: 10.1103/PhysRevA.107.033702
Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.033702#
来源：科学网 小柯机器人