Efficient loading and cooling in a dynamic optical evanescent-wave microtrap

Creating atom-number states around tapered optical fibres by loading from an optical lattice

We describe theoretically a setup in which a tapered optical nanofibre is introduced into an optical lattice potential for cold atoms. Firstly, we consider the disturbance to the geometry of the lattice potential due to scattering of the lattice lasers from the dielectric fibre surface and show that the resulting distortion to the lattice can be minimized by placing the fibre at an appropriate position in the lattice. We then calculate the modifications of the local potentials that are achievable by transmitting off-resonant light through the fibre. The availability of such a technique holds t…

单原子的纳米光子腔冷却

Nanophotonic cavity cooling of a single atom

本文研究了与弱泵浦纳米光子腔强耦合的二能级原子的动力学，计算了相关作用力并证明腔表面存在三维冷却区，通过蒙特卡罗模拟验证了腔冷却能有效将单原子从自由空间装载入表面微阱。

单原子在集成光子谐振腔倏逝场中的捕获

Single-atom trapping in the evanescent field of an integrated photonic resonator

研究通过倏逝场机制实现单个超冷原子在硅氮微环谐振腔中的高效捕获，展示了无持续冷却下的捕获持续时间对数扩展，实现了单原子与谐振腔的高效耦合。

An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays

Large arrays of individually controlled atoms trapped in optical tweezers are a very promising platform for quantum engineering applications. However, to date, only disordered arrays have been demonstrated, due to the non-deterministic loading of the traps. Here, we demonstrate the preparation of fully loaded, two-dimensional arrays of up to 50 microtraps each containing a single atom, and arranged in arbitrary geometries. Starting from initially larger, half-filled matrices of randomly loaded traps, we obtain user-defined target arrays at unit filling. This is achieved with a real-time contro…

用于冷$^{87}$Rb原子的基于光学纳米纤维的偶极阱的机器学习优化

Machine learner optimization of optical nanofiber-based dipole traps for cold $^{87}$Rb atoms

本研究利用环内随机人工神经网络机器学习器优化激光冷却过程，使基于光学纳米纤维的双色偶极阱中$^{87}$Rb原子的捕获数提升约50%、峰值光学深度提升70%，为倏逝场介导的集体原子-光相互作用研究提供支持。

Nanofiber-based optical trapping of cold neutral atoms

We present experimental techniques and results related to the optimization and characterization of our nanofiber-based atom trap [Vetsch et al., Phys. Rev. Lett. 104, 203603 (2010)]. The atoms are confined in an optical lattice which is created using a two-color evanescent field surrounding the optical nanofiber. For this purpose, the polarization state of the trapping light fields has to be properly adjusted. We demonstrate that this can be accomplished by analyzing the light scattered by the nanofiber. Furthermore, we show that loading the nanofiber trap from a magneto-optical trap leads to …

Characterization of Suspended Membrane Waveguides towards a Photonic Atom Trap Integrated Platform

We demonstrate an optical waveguide device, capable of supporting the high, in-vacuum, optical power necessary for trapping a single atom or a cold atom ensemble with evanescent fields. Our photonic integrated platforms, with suspended membrane waveguides, successfully manages optical powers of 6 mW (500 um span) to nearly 30 mW (125 um span) over an un-tethered waveguide span. This platform is compatible with laser cooling and magneto-optical traps (MOTs) in the vicinity of the suspended waveguide, called the membrane MOT and the needle MOT, a key ingredient for efficient trap loading. We eva…

Integrated Optical Dipole Trap for Cold Neutral Atoms with an Optical Waveguide Coupler

An integrated optical dipole trap uses two-color (red and blue-detuned) traveling evanescent wave fields for trapping cold neutral atoms. To achieve longitudinal confinement, we propose using an integrated optical waveguide coupler, which provides a potential gradient along the beam propagation direction sufficient to confine atoms. This integrated optical dipole trap can support an atomic ensemble with a large optical depth due to its small mode area. Its quasi-TE0 waveguide mode has an advantage over the HE11 mode of a nanofiber, with little inhomogeneous Zeeman broadening at the trapping re…

基于光学纳米光纤测试平台的膜波导光子集成电路平台用于芯片级量子惯性传感的基准测试

Optical Nanofiber Testbeds for Benchmarking Membrane-Waveguide Photonic Integrated Circuit Platforms toward On-Chip Quantum Inertial Sensing

本文提出三种创新，通过光学纳米光纤测试平台验证了蒸发场原子引导，展示了低功率引导自由运动的铯原子，并验证了原子相干性，为芯片级量子惯性传感奠定了基础。