论文标题
连续频率弱电场测量与Rydberg原子
Continuous-frequency weak electric field measurement with Rydberg atoms
论文作者
论文摘要
我们基于Rydberg原子蒸气电池中的差距差异AC剧烈效应，展示了连续的频场测量。在此配置中，一个强大的远距离抗谐波场，称为局部振荡器（LO）场，充当增益，将Rydberg水平转移到高灵敏度区域。与LO场相差数百kHz差异的入射弱信号场与Rydberg系统中的LO场混合，以生成中间频率（IF）信号，这是由Rydberg电磁诱导的透明度（Rydberg-eit）光谱读取的。不像光谱共振，我们意识到使用单个Rydberg状态将信号频率从2 GHz到5 GHz的电场测量。最小可检测的归档强度降至2.31〜 $μ$ v/cm，线性动态范围超过65〜dB。可检测到的最小可检测到的可与谐振的微波式Rydberg杂差接收器相媲美，该系统是1.45〜 $ $ $ v/cm。我们还显示该系统具有固有的极化选择性功能。我们的方法可以提供高灵敏度的电场测量，并扩展到任意频率测量。
We demonstrate a continuous frequency electric field measurement based on the far off-resonant AC stark effect in a Rydberg atomic vapor cell. In this configuration, a strong far off-resonant field, denoted as a local oscillator (LO) field, acts as a gain shifting the Rydberg level to a high sensitivity region. An incident weak signal field with a few hundreds of kHz difference from the LO field is mixed with the LO field in Rydberg system to generate an intermediate frequency (IF) signal, which is read out by the Rydberg electromagnetically induced transparency (Rydberg-EIT) spectroscopy. Not like resonant EIT-AT spectra, we realize the electric field measurement of the signal frequency from 2 GHz to 5 GHz using a single Rydberg state. A minimum detectable filed strength is down to 2.31~$μ$V/cm and a linear dynamic range is over 65~dB. The minimum detectable filed is comparable with a resonant microwave-dressed Rydberg heterodyne receiver using the same system, which is 1.45~$μ$V/cm. We also show the system has an inherent polarization selectivity feature. Our method can provide a high sensitivity of electric field measurement and be extended to arbitrary frequency measurements.
