Tiporlini Valentina, Alameh Kamal
Electron Science Research Institute, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia.
ScientificWorldJournal. 2013 May 26;2013:858379. doi: 10.1155/2013/858379. Print 2013.
Quantum magnetometers based on optical pumping can achieve sensitivity as high as what SQUID-based devices can attain. In this paper, we discuss the principle of operation and the optimal design of an optically pumped quantum magnetometer. The ultimate intrinsic sensitivity is calculated showing that optimal performance of the magnetometer is attained with an optical pump power of 20 μW and an operation temperature of 48°C. Results show that the ultimate intrinsic sensitivity of the quantum magnetometer that can be achieved is 327 fT/Hz(½) over a bandwidth of 26 Hz and that this sensitivity drops to 130 pT/Hz(½) in the presence of environmental noise. The quantum magnetometer is shown to be capable of detecting a sinusoidal magnetic field of amplitude as low as 15 pT oscillating at 25 Hz.
基于光泵浦的量子磁力计能够实现与基于超导量子干涉器件（SQUID）的设备相当的高灵敏度。在本文中，我们讨论了光泵浦量子磁力计的工作原理和优化设计。计算了其最终本征灵敏度，结果表明，当光泵浦功率为20 μW且工作温度为48°C时，磁力计可实现最佳性能。结果显示，在26 Hz带宽内，该量子磁力计能够实现的最终本征灵敏度为327 fT/Hz(½)，在存在环境噪声的情况下，该灵敏度降至130 pT/Hz(½)。实验表明，该量子磁力计能够检测到幅度低至15 pT、频率为25 Hz的正弦磁场。
