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arXiv 2003.10989quant-phcond-mat.quant-gasphysics.atom-ph
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用于冷原子实验的动态低噪声微波源

Dynamical low-noise microwave source for cold-atom experiments

Bernd Meyer-Hoppe, Maximilian Baron, Christophe Cassens, Fabian Anders, Alexander Idel, Jan Peise, Carsten Klempt

AI总结:

针对冷原子实验对超低噪声动态可控微波场的需求,提出结合7 GHz超低噪声振荡器与射频直接数字合成器的双路低相位噪声微波源,实现亚微秒级参数更新与低积分相位噪声,支持整形脉冲与复合脉冲以抑制噪声。

摘要:

在量子体系下生成与操控超冷原子系综,需要使用具备超低噪声性能的动态可控微波场。本文提出一种具有两条独立可控输出路径的低相位噪声微波源,两条路径生成的频率范围均为6.835 GHz ± 25 MHz,用于⁸⁷Rb的超精细跃迁。该微波源结合了两款商用频率合成器:一个7 GHz的超低噪声振荡器,以及一个用于射频的直接数字合成器。实验测得其在10 Hz至100 kHz范围内的积分相位噪声低至480 μrad,且频率、幅度和相位的快速更新时间在亚微秒量级。这种高动态控制能力可生成整形脉冲波形,并能部署复合脉冲以抑制多种噪声源的影响。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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