近日，兰州大学的谭磊及其研究小组与中国科学院物理研究所的刘伍明合作并取得一项新进展。经过不懈努力，他们实现双耦合辅助球辅助腔磁力系统中的双增强量子纠缠。相关研究成果已于2024年8月5日在国际知名学术期刊《物理评论A》上发表。
该研究团队提出了一种机制，通过将辅助磁球与标准腔磁机械系统耦合，使光子-声子纠缠显著增强两倍。变形的球体充当冷库，通过调节耦合强度之间的关系，可以同时冷却叠加在光学腔和机械振子上的两种混合模式，从而使研究人员能够获得较大的稳态腔-振子纠缠。
在双模冷却效应的基础上，由于非叠加光学模式可以通过辅助球体得到有效冷却，因此通过开启单耦合辅助球体辅助通道，可以显著改善稳态光子-声子纠缠。更重要的是，通过切换双耦合辅助球体辅助（DC-ASA）通道，光子-声子纠缠可以再次显著增强，其中辅助球体充当额外的冷库，同时冷却非叠加光学模式和库模式。
此外，在DC-ASA机制下，稳态纠缠对机械热噪声具有更强的鲁棒性。该DC-ASA方案有望应用于加速磁机械冷却并增强磁机械压缩。
附：英文原文
Title: Twice-enhanced quantum entanglement in a dual-coupled auxiliary-sphere-assisted cavity magnomechanical system
Author: Zhi-Qiang Liu, Jie Liu, Lei Tan, Wu-Ming Liu
Issue&Volume: 2024/08/05
Abstract: We propose a mechanism to significantly enhance the photon-phonon entanglement twice by coupling an auxiliary magnetic sphere to a standard cavity magnomechanical system. The deformed sphere acts as a cold reservoir that can simultaneously cool two hybrid modes superposed over the optical cavity and the mechanical oscillator by modulating the relationship between the coupling strengths, which enables us to obtain large steady-state cavity-oscillator entanglement. On the basis of the double-mode cooling effect, the steady-state photon-phonon entanglement can be significantly improved by opening the single-coupled auxiliary-sphere-assisted channel due to the fact that the nonsuperposed optical mode can be efficiently cooled via the auxiliary sphere. More importantly, the photon-phonon entanglement can be significantly enhanced again by switching the dual-coupled auxiliary-sphere-assisted (DC-ASA) passage, where the auxiliary sphere serves as an additional cold bath to simultaneously cool both the nonsuperposed optical mode and the reservoir mode. Moreover, in the DC-ASA regime, the steady-state entanglement is more robust against the mechanical thermal noise. This DC-ASA scheme can be potentially applied to accelerate magnomechanical cooling and enhance magnomechanical squeezing.
DOI: 10.1103/PhysRevA.110.023707
Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.023707
期刊信息
Physical Review A：《物理评论A》，创刊于1970年。隶属于美国物理学会，最新IF：2.97
官方网址：https://journals.aps.org/pra/
投稿链接：https://authors.aps.org/Submissions/login/new