Geometric pulses enable fast, error-correcting state transitions in co-located spin ensembles without frequency selectivity, demonstrated at milliradian precision over hours on nuclear spins.
New limit on Lorentz and CPT-violating neutron spin interactions
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abstract
We performed a search for neutron spin coupling to a Lorentz and CPT-violating background field using a magnetometer with overlapping ensembles of K and $^3$He atoms. The co-magnetometer is mounted on a rotary platform for frequent reversal of its orientation. We measure sidereal oscillations in the signal to search for anomalous spin coupling of extra-solar origin. We determine the equatorial components of the background field interacting with the neutron spin to be $\widetilde{b}^n_X = (0.1 \pm 1.6) \times 10^{-33}$ GeV and $\widetilde{b}^n_Y = (2.5 \pm 1.6) \times 10^{-33}$ GeV, improving on the previous limit by a factor of 30. This measurement represents the highest energy resolution of any spin anisotropy experiment.
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UNVERDICTED 2representative citing papers
The paper reviews comagnetometry as a sensitive probe for new physics including EDMs, Lorentz violation, CP-violating forces, and axionic dark matter, while discussing prospects for further sensitivity gains based on signal-to-noise.
citing papers explorer
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Error-correcting transition pulses for co-located spin ensembles without frequency selectivity
Geometric pulses enable fast, error-correcting state transitions in co-located spin ensembles without frequency selectivity, demonstrated at milliradian precision over hours on nuclear spins.
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Comagnetometer probes of dark matter and new physics
The paper reviews comagnetometry as a sensitive probe for new physics including EDMs, Lorentz violation, CP-violating forces, and axionic dark matter, while discussing prospects for further sensitivity gains based on signal-to-noise.