Related papers: Ultrasensitive atomic comagnetometer with enhanced nuclear spin coherence

Ultrasensitive atomic comagnetometer with enhanced nuclear spin coherence

URL: http://arxiv.org/abs/2210.09027v1
Date: Mon, 17 Oct 2022 12:45:21 GMT
Title: Ultrasensitive atomic comagnetometer with enhanced nuclear spin coherence
Authors: Kai Wei, Tian Zhao, Xiujie Fang, Zitong Xu, Chang Liu, Qian Cao, Arne Wickenbrock, Yanhui Hu, Wei Ji, Dmitry Budker
Abstract summary: A new relaxation mechanism is found in alkali-noble-gas comagnetometers. operating in the self-compensation regime, our device achieves an ultrahigh inertial rotation sensitivity of $3times10-8$,rad/s/Hz$1/2$. We propose to use this comagnetometer to search for exotic spin-dependent interactions involving proton and neutron spins.
Score: 8.784565323288149
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Achieving high energy resolution in spin systems is important for fundamental physics research and precision measurements, with alkali-noble-gas comagnetometers being among the best available sensors. We found a new relaxation mechanism in such devices, the gradient of the Fermi-contact-interaction field that dominates the relaxation of hyperpolarized nuclear spins. We report on precise control over spin distribution, demonstrating a tenfold increase of nuclear spin hyperpolarization and transverse coherence time with optimal hybrid optical pumping. Operating in the self-compensation regime, our $^{21}$Ne-Rb-K comagnetometer achieves an ultrahigh inertial rotation sensitivity of $3\times10^{-8}$\,rad/s/Hz$^{1/2}$ in the frequency range from 0.2 to 1.0 Hz, which is equivalent to the energy resolution of $3.1\times 10^{-23}$\,eV/Hz$^{1/2}$. We propose to use this comagnetometer to search for exotic spin-dependent interactions involving proton and neutron spins. The projected sensitivity surpasses the previous experimental and astrophysical limits by more than four orders of magnitude.

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