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Updated: May 9, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Coherent evolution of superexchange interaction in seconds-long optical clock spectroscopy.
William R Milner1, Stefan Lannig1, Mikhail Mamaev1,2
1JILA, National Institute of Standards and Technology and University of Colorado, Boulder, CO, USA.
Science (New York, N.Y.)
|May 1, 2025
Summary
Researchers explored quantum magnetism in atomic clocks using a Fermi-Hubbard Hamiltonian in an optical lattice. They observed tunable spin anisotropy and coherent superexchange, improving atomic coherence for metrology.
Area of Science:
- Atomic physics
- Quantum magnetism
- Metrology
Background:
- Scaling atomic clock performance necessitates understanding complex many-body Hamiltonians.
- Degenerate Fermi gases in optical lattices offer a platform to study these Hamiltonians.
Purpose of the Study:
- To investigate the effects of a tunable Fermi-Hubbard Hamiltonian on atomic clock performance.
- To explore quantum magnetism and spin entanglement using optical lattice clocks.
Main Methods:
- Utilized a degenerate Fermi gas in a 3D optical lattice.
- Applied a clock laser to induce spin-orbit coupling and XXZ spin anisotropy.
- Employed imaging spectroscopy to map atomic coherence regimes.
- Tuned lattice confinement and on-site interactions.
Main Results:
- Observed coherent superexchange interactions.
- Demonstrated tunability of superexchange via on-site interaction and energy shifts.
- Identified favorable atomic coherence regimes.
- Observed Ramsey fringe contrast modulation over timescales exceeding 1 second.
Conclusions:
- The study provides a foundation for utilizing 3D optical lattice clocks to probe quantum magnetism.
- Tunable spin anisotropy and coherent superexchange are key factors for enhancing atomic clock performance.
- This research opens avenues for exploring spin entanglement in metrological applications.
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