A digital alkali spin maser

Stuart Ingleby; Paul Griffin; Terry Dyer; Marcin Mrozowski; Erling Riis

doi:10.1038/s41598-022-16910-z

A digital alkali spin maser

Stuart Ingleby, Paul Griffin, Terry Dyer, Marcin Mrozowski, Erling Riis

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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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
Article number	12888
Number of pages	7
Journal	Scientific Reports
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41598-022-16910-z
Publication status	Published - 28 Jul 2022

Keywords

spin maser
optically pumped magnetometer (OPM)
spin precession
digital signal processing

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10.1038/s41598-022-16910-zLicence: CC BY 4.0

Ingleby-etal-SR-2022-A-digital-alkali-spin-maserFinal published version, 1.84 MBLicence: CC BY 4.0

Cite this

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title = "A digital alkali spin maser",

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 Cram{\'e}r-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.",

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T1 - A digital alkali spin maser

AU - Ingleby, Stuart

AU - Griffin, Paul

AU - Dyer, Terry

AU - Mrozowski, Marcin

AU - Riis, Erling

PY - 2022/7/28

Y1 - 2022/7/28

N2 - 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.

AB - 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.

KW - spin maser

KW - optically pumped magnetometer (OPM)

KW - spin precession

KW - digital signal processing

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A digital alkali spin maser

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A digital alkali spin maser

Abstract

Keywords

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UK National Quantum Technology Hub in Sensing and Timing

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