论文标题
冷原子实验的动力低噪声微波源
Dynamical low-noise microwave source for cold-atom experiments
论文作者
论文摘要
量子制度中超速原子合物的产生和操纵要求使用具有超低噪声性能的动态控制的微波场。在这里，我们提出了一个具有两个独立控制的输出路径的低相噪声微波源。这两种路径都在$ 6.835 \，$ ghz $ \ pm $ 25 \，$ MHz的范围内生成频率，用于$^{87} $ rb。提出的微波源结合了两个市售的频率合成器：$ 7 \ $ ghz的超低噪声振荡器，以及用于放射线的直接数字合成器。我们证明了低$ 480 \，μ$ rad的低集成相位噪声，$ 10 \，$ hz至$ 100 \，$ kHz，频率，幅度和相位的快速更新，分别为$ $ $ $ $ s的时间尺度。高度动态的控制能够产生形状的脉冲形式和复合脉冲的部署，以抑制各种噪声源的影响。
The generation and manipulation of ultracold atomic ensembles in the quantum regime require the application of dynamically controllable microwave fields with ultra-low noise performance. Here, we present a low-phase-noise microwave source with two independently controllable output paths. Both paths generate frequencies in the range of $6.835\,$GHz $\pm$ $25\,$MHz for hyperfine transitions in $^{87}$Rb. The presented microwave source combines two commercially available frequency synthesizers: an ultra-low-noise oscillator at $7\,$GHz and a direct digital synthesizer for radiofrequencies. We demonstrate a low integrated phase noise of $480\,μ$rad in the range of $10\,$Hz to $100\,$kHz and fast updates of frequency, amplitude and phase in sub-$μ$s time scales. The highly dynamic control enables the generation of shaped pulse forms and the deployment of composite pulses to suppress the influence of various noise sources.
