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Abstract
Self-oscillating atomic magnetometers, in which the precession of atomic spins in a magnetic field is driven by resonant modulation, offer high sensitivity and dynamic range. Phase-coherent feedback from the detected signal to the applied modulation creates a resonant spin maser system, highly responsive to changes in the background magnetic field. Here we show a system in which the phase condition for resonant precession is met by digital signal processing integrated into the maser feedback loop. This system uses a modest chip-scale laser and mass-produced dual-pass caesium vapour cell and operates in a 50 μT field, making it a suitable technology for portable measurements of the geophysical magnetic field. We demonstrate a Cramér-Rao lower bound-limited resolution of 50 fT at 1 s sampling cadence, and a sensor bandwidth of 10 kHz. This device also represents an important class of atomic system in which low-latency digital processing forms an integral part of a coherently-driven quantum system.
Original language | English |
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Article number | 12888 |
Number of pages | 7 |
Journal | Scientific Reports |
Volume | 12 |
Issue number | 1 |
DOIs | |
Publication status | Published - 28 Jul 2022 |
Keywords
- spin maser
- optically pumped magnetometer (OPM)
- spin precession
- digital signal processing
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Dive into the research topics of 'A digital alkali spin maser'. Together they form a unique fingerprint.Projects
- 1 Finished
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UK National Quantum Technology Hub in Sensing and Timing
Griffin, P. (Principal Investigator), Hunter, D. (Principal Investigator), Johnson, S. (Principal Investigator), McGilligan, J. P. (Principal Investigator), Moriya, P. (Principal Investigator), Riis, E. (Principal Investigator), Arnold, A. (Co-investigator), Griffin, P. (Co-investigator), Hastie, J. (Co-investigator), Ingleby, S. (Co-investigator), Moriya, P. (Research Co-investigator) & Moriya, P. (Research Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/12/19 → 30/11/24
Project: Research
Datasets
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Data for: "A Digital Alkali Spin Maser"
Ingleby, S. (Creator), University of Strathclyde, 25 Apr 2022
DOI: 10.15129/e6e558c9-135d-431e-a8f2-63d0fa647fbb
Dataset