Cooling of Atoms in Optical Cavities by Collective Dynamics

通过集体动力学冷却光学腔中的原子

• 批准号: EP/E00332X/1
• 负责人: Ferruccio Renzoni
• 金额: $ 58.31万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE00332X%2F1
• 关键词: Cooling; Atoms; Optical; Cavities; Collective

Atoms in a standing wave of light experience a periodic potential called an optical lattice. The study of cold atoms in an optical lattice has become a major frontier of cold atom physics over the last few years. We propose to open a new domain of this study by having the standing waves within an optical cavity. This is expected to induce new collective effects through the common coupling of the atoms to a single photon mode. For example, we anticipate that collective effects within a cavity can be expected to cool a large number N of atoms or molecules to very low temperatures. As our initial theoretical [1,2] and first incomplete experimental studies [3,4,5] show, maximum cooling rates are expected in the presence of a red-detuned laser field and when the cavity leakage rate is as large as the square root of N times the single-particle coupling constants. The phonons, describing the movement of the particles inside the optical lattice potential, are then continuously converted into photons, which leak out through the cavity mirrors. The result is an evaporation of the kinetic energy in the system on a time scale given by the very large leakage rate of photons through the resonator mirror. We propose to study the cooling and related collective effects that are expected to occur naturally in these nonlinear quantum systems and to compare experimental results with detailed and newly developed theoretical models. The aim of the proposal is to begin a study of these effects through a collaboration of experimenters and theorists, bringing together expertise in cold atoms, cavity QED, quantum physics, many body systems and non-linear dynamics.[1] A. Beige, P.L. Knight, and G. Vitiello, Cooling Many Particles at Once, New J. Phys. 7, 96 (2005).[2] A. Beige, P.L. Knight, and G. Vitiello, Cooling many particles to very low temperatures, Braz. J. Phys. 35, 403 (2005).[3] J. F. Roch, K. Vigneron, P. Grelu, A. Sinatra, J. P. Poizat, and P. Grangier, Quantum Nondemolition Measurements using Cold Trapped Atoms, Phys. Rev. Lett. 78, 634 (1997). [4] H. W. Chan, A. T. Black, and V. Vuletic, Observation of Collective-Emission-Induced Cooling of Atoms in an Optical Cavity, Phys. Rev. Lett. 90, 063003 (2003).[5] Private communication with Ph. Grangier.

光驻波中的原子经历称为光学晶格的周期性势。 The study of cold atoms in an optical lattice has become a major frontier of cold atom physics over the last few years.我们建议通过在光学腔内设置驻波来开辟这项研究的新领域。预计这将通过原子与单光子模式的共同耦合引发新的集体效应。例如，我们预计空腔内的集体效应可以将大量 N 个原子或分子冷却到非常低的温度。正如我们最初的理论 [1,2] 和第一个不完整的实验研究 [3,4,5] 所示，在存在红失谐激光场且腔泄漏率与 N 乘以单粒子耦合常数的平方根一样大时，预计会出现最大冷却速率。声子描述了光学晶格势内粒子的运动，然后不断地转换成光子，光子通过腔镜泄漏出去。结果是系统中的动能在由光子通过谐振器镜的非常大的泄漏率给出的时间尺度上蒸发。我们建议研究这些非线性量子系统中自然发生的冷却和相关集体效应，并将实验结果与详细的新开发的理论模型进行比较。该提案的目的是通过实验者和理论家的合作开始对这些效应的研究，汇集冷原子、腔 QED、量子物理学、许多体系统和非线性动力学方面的专业知识。 [1] A. Beige, P.L. Knight 和 G. Vitiello，《同时冷却许多粒子》，New J. Phys。 7, 96 (2005).[2] A. Beige, P.L. Knight 和 G. Vitiello，将许多颗粒冷却到非常低的温度，Braz。 J. Phys。 35, 403 (2005).[3] J. F. Roch、K. Vigneron、P. Grelu、A. Sinatra、J. P. Poizat 和 P. Grangier，使用冷阱原子进行量子非破坏测量，物理学。莱特牧师。 78, 634 (1997). [4] H. W. Chan、A. T. Black 和 V. Vuletic，光学腔中原子集体发射诱导冷却的观察，物理学。莱特牧师。 90, 063003 (2003).[5]与格兰吉尔博士的私人交流。