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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 Active
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UK National Quantum Technology Hub in Sensors and Timing
Riis, E., Arnold, A., Griffin, P. & Hastie, J.
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