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Spin damping in an rf atomic magnetometer

Author(s): Alem, Orang; Sauer, Karen L; Romalis, Michael V

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Abstract: Under negative feedback, the quality factor Q of a radio-frequency atomic magnetometer can be decreased by more than two orders of magnitude, so that any initial perturbation of the polarized spin system can be rapidly damped, preparing the magnetometer for detection of the desired signal. We find that noise is also suppressed under such spin damping, with a characteristic spectral response corresponding to the type of noise; therefore magnetic, photon shot, and spin-projection noise can be measured distinctly. While the suppression of resonant photon shot noise implies the closed-loop production of polarization-squeezed light, the suppression of resonant spin-projection noise does not imply spin squeezing, rather simply the broadening of the noise spectrum with Q. Furthermore, the application of spin damping during phase-sensitive detection suppresses both signal and noise in such a way as to increase the sensitivity bandwidth. We demonstrate a threefold increase in the magnetometer’s bandwidth while maintaining 0.3 fT/root Hz sensitivity. DOI: 10.1103/PhysRevA.87.013413
Publication Date: Jan-2013
Electronic Publication Date: 16-Jan-2013
Citation: Alem, Orang, Sauer, Karen L, Romalis, Mike V. (2013). Spin damping in an rf atomic magnetometer. PHYSICAL REVIEW A, 87 (10.1103/PhysRevA.87.013413
DOI: doi:10.1103/PhysRevA.87.013413
ISSN: 1050-2947
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW A
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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