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首页> 外文期刊>Review of Scientific Instruments >A low phase noise microwave source for atomic spin squeezing experiments in 87Rb
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A low phase noise microwave source for atomic spin squeezing experiments in 87Rb

机译:用于 87 Rb中原子自旋压缩实验的低相位噪声微波源

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摘要

We describe and characterize a simple, low cost, low phase noise microwave source that operates near 6.800 GHz for agile, coherent manipulation of ensembles of 87Rb. Low phase noise is achieved by directly multiplying a low phase noise 100 MHz crystal to 6.8 GHz using a nonlinear transmission line and filtering the output with custom band-pass filters. The fixed frequency signal is single sideband modulated with a direct digital synthesis frequency source to provide the desired phase, amplitude, and frequency control. Before modulation, the source has a single sideband phase noise near -140 dBc/Hz in the range of 10 kHz–1 MHz offset from the carrier frequency and -130 dBc/Hz after modulation. The resulting source is estimated to contribute added spin-noise variance 16 dB below the quantum projection noise level during quantum nondemolition measurements of the clock transition in an ensemble 7 × 105 87Rb atoms.
机译:我们描述并描述了一个简单,低成本,低相位噪声的微波源,该源在6.800 GHz附近运行,用于 87 Rb集合的敏捷,连贯处理。通过使用非线性传输线将低相位噪声100 MHz晶体直接乘以6.8 GHz并使用定制的带通滤波器对输出进行滤波,可以实现低相位噪声。固定频率信号使用直接数字合成频率源进行单边带调制,以提供所需的相位,幅度和频率控制。调制之前,源具有-140 dBc / Hz附近的单边带相位噪声,与载波频率之间的偏移范围为10 kHz–1 MHz,调制后为-130 dBc / Hz。在集成的7×10 5 87 时钟转换的量子非拆卸测量过程中,估计由此产生的源在量子投影噪声级以下比量子投影噪声级低16 dB。 Rb原子。

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