Acoustic frequency atomic spin oscillator in the quantum regime

Jun Jia, Valeriy Novikov, Tulio Brito Brasil, Emil Zeuthen, Jörg Helge Müller and Eugene S. Polzik ()
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Jun Jia: Niels Bohr Institute, University of Copenhagen
Valeriy Novikov: Niels Bohr Institute, University of Copenhagen
Tulio Brito Brasil: Niels Bohr Institute, University of Copenhagen
Emil Zeuthen: Niels Bohr Institute, University of Copenhagen
Jörg Helge Müller: Niels Bohr Institute, University of Copenhagen
Eugene S. Polzik: Niels Bohr Institute, University of Copenhagen

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Quantum noise reduction and entanglement-enhanced sensing in the acoustic frequency range is an outstanding challenge relevant for a number of applications including magnetometry and broadband noise reduction in gravitational wave detectors. Here we experimentally demonstrate quantum behavior of a macroscopic atomic spin oscillator in the acoustic frequency range. Quantum back-action of the spin measurement, ponderomotive squeezing of light, and virtual spring softening are observed at oscillation frequencies down to the sub-kHz range. Quantum noise sources characteristic of spin oscillators operating in the near-DC frequency range are identified and means for their mitigation are presented.

Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42059-y

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DOI: 10.1038/s41467-023-42059-y

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