Abstract
We present a novel high-field optical quantum magnetometer based on saturated absorption spectroscopy on the extreme angular-momentum states of the cesium D2 line. With key features including continuous readout, high sampling rate, and sensitivity and accuracy in the ppm range, it represents a competitive alternative to conventional techniques for measuring magnetic fields of several teslas. The prototype has four small separate field probes, and all support electronics and optics are fitted into a single 19-inch rack to make it compact, mobile, and robust. The field probes are fiber coupled and made from nonmetallic components, allowing them to be easily and safely positioned inside a 7 T MRI scanner. We demonstrate the capabilities of this magnetometer by measuring two different MRI sequences, and we show how it can be used to reveal imperfections in the gradient coil system, to highlight the potential applications in medical MRI. We propose the term EXAAQ (EXtreme Angular-momentum Absorption-spectroscopy Quantum) magnetometry, for this novel method.
| Original language | English |
|---|---|
| Article number | 020320 |
| Journal | PRX Quantum |
| Volume | 5 |
| Issue number | 2 |
| Number of pages | 13 |
| ISSN | 2691-3399 |
| DOIs | |
| Publication status | Published - Apr 2024 |
Bibliographical note
Funding Information:This project has received funding from the Danish Quantum Innovation Center (Qubiz)/Innovation Fund Denmark, the European Union\u2019s Horizon 2020 research and innovation programme under Grant Agreements No. 820393 and No. 787520, and Villum Fonden under a Villum Investigator Grant, Grant No. 25880. The 7 T MRI scanner was donated by the John and Birthe Meyer Foundation and The Danish Agency for Science, Technology and Innovation (Grant No. 0601-01370B).
Publisher Copyright:
© 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.