Near-Unitary Spin Squeezing in ^{171}Yb
Name
PhysRevLett.122.223203.pdf
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1.99 MB
Format
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Checksum (MD5)
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Author(s)
Braverman, Boris
Kawasaki, Akio
Pedrozo-Peñafiel, Edwin
Colombo, Simone
Shu, Chi
Li, Zeyang
Mendez, Enrique
Yamoah, Megan
Salvi, Leonardo
Akamatsu, Daisuke
Date Issued
June 5, 2019
Publisher
American Physical Society
Citation
Phys. Rev. Lett. 122, 223203 (2019)
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT-Harvard Center for Ultracold Atoms
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.122.223203
