Near-Unitary Spin Squeezing in ^{171}Yb
Author(s)
Braverman, Boris; Kawasaki, Akio; Pedrozo-Peñafiel, Edwin; Colombo, Simone; Shu, Chi; Li, Zeyang; Mendez, Enrique; Yamoah, Megan; Salvi, Leonardo; Akamatsu, Daisuke; Xiao, Yanhong; Vuletić, Vladan; ... Show more Show less
DownloadPhysRevLett.122.223203.pdf (1.994Mb)
Terms of use
Metadata
Show full item recordAbstract
Spin squeezing can improve atomic precision measurements beyond the standard quantum limit (SQL), and unitary spin squeezing is essential for improving atomic clocks. We report substantial and nearly unitary spin squeezing in ^{171}Yb, an optical lattice clock atom. The collective nuclear spin of ∼10^{3} atoms is squeezed by cavity feedback, using light detuned from the system’s resonances to attain unitarity. The observed precision gain over the SQL is limited by state readout to 6.5(4) dB, while the generated states offer a gain of 12.9(6) dB, limited by the curvature of the Bloch sphere. Using a squeezed state within 30% of unitarity, we demonstrate an interferometer that improves the averaging time over the SQL by a factor of 3.7(2). In the future, the squeezing can be simply transferred onto the optical-clock transition of ^{171}Yb.
Date issued
2019-06-05Department
Massachusetts Institute of Technology. Department of Physics; MIT-Harvard Center for Ultracold Atoms; Massachusetts Institute of Technology. Research Laboratory of ElectronicsPublisher
American Physical Society
Citation
Phys. Rev. Lett. 122, 223203 (2019)
Version: Final published version