Casimir微力学振子的量子光力学调控研究

With rapid advances in nano-chips and integrated optoelectric devices, the Casimir force, arising from the zero-point energy of quantum vacuum, plays a significant role in these nanoscale structures. Meanwhile, the emerging field of cavity optomechanics makes it practical to cool a micromechanical oscillator into its ground state and then control its quantum states. Inspiring by these advances, in this project, we propose to combine the two fields of Casimir forces and cavity optomechanics, enabling studies of quantum-state control of Casimir micromechanical oscillator, particularly the impacts of Casimir force on quantum oscillator's state, Casimir-force-based quantum state transfer between two micromechanical oscillators, and hybrid quantum systems with nanomechanical cantilever and cold atoms coupled by the Casimir force. In view of recent experimental advances, e.g. nonlinear Casimir classical oscillator, coupled Casimir oscillators fabricated in a micromechanical semiconductor chip, and hybrid cantilever-atom hybrid system, our project holds the promise to be tested in forthcoming experiments, moving a new crossed field forwards (combining Casimir force measurement, nanoscale structure and cavity optomechanics) and also providing new paths for designing or applying new-generation quantum devices with Casimir micromechanical oscillators.

随着纳米芯片和光电器件集成度提高，来自真空零点能、以虚光子为媒介的Casmir力的作用越来越明显，诸多实验已展示出Casimir力对微力学振子及光力混合系统的重要影响；同时，微腔光力学的快速发展，使得微振子冷却到基态并实现量子调控成为现实。本课题结合Casimir效应和量子光力学，研究Casimir力辅助下的微振子量子光力调控技术，包括Casimir力对微振子量子态的影响（声子压缩）、Casimir力耦合的纳米振子量子态传递、以及Casimir冷振子-冷原子混合量子系统及其应用。目前，这方面研究还比较少。考虑到最近一系列新实验（例如非线性Casimir经典振子、半导体微力芯片上的耦合Casimir振子、纳米悬臂振子-冷原子混合系统），该课题有望为下一步实验提供理论支持，推动Casimir力精密测量、纳米微结构和量子光力调控交叉研究，为设计和应用新一代Casimir量子微振子器件提供新方案。

纳米微刻技术和量子物理的结合导致光力学的诞生和快速发展，在宏观量子态产生与探测、量子声学、电声光转换与运动传感技术等方面有重要应用。同时，奇异点（EP）物理学研究快速走向实验与应用，展现诸多违反直觉的新奇效应，如耗散诱导透明、非互易传输、手征激光与隐形传感等。过去四年内，在国家自然科学基金项目支持下，我们围绕Casimir力（量子真空效应）、光力学与纳米器件，主要研究了三个方面的问题：Casimir力导致的光力效应；奇异点光力学；手性量子器件。发表SCI论文21篇，很好地完成了本项目的目标。我们在宇称-时间声光混沌、反转光力诱导透明、EP灵敏探测、高阶EP、缺陷声子激光与耗散光力诱导透明等方面做出一系列成果。这些工作被国内外同行引用超过百次，其中4篇ESI高被引，1篇IOP高被引；EP灵敏探测与高阶EP获得实验实现。同时，我们在手性量子器件方面也取得一系列成果：利用克尔非线性腔实现手性自发破缺、基于旋转腔的非互易光学透射、非互易光子阻塞、超灵敏纳米粒子探测器、非互易声子激光等。相关工作发表在Nature、Phys. Rev. Lett.、Optica、Phys. Rev. Appl.、Photonics Res.等。