Spin waves and Collisional Frequency Shifts of a Trapped-Atom Clock

Abstract

We excite spin-waves with spatially inhomogeneous pulses and study the resulting frequency shifts of a chip-scale atomic clock of trapped ${}^{87}$Rb. The density-dependent frequency shifts of the hyperfine transition simulate the s-wave collisional frequency shifts of fermions, including those of optical lattice clocks. As the spin polarizations oscillate in the trap, the frequency shift reverses and it depends on the area of the second Ramsey pulse, exhibiting a predicted beyond mean-field frequency shift. Numerical and analytic models illustrate the observed behaviors.

Will appear soon in Physical Review Letters - Typos corrected

References in corpus (3)

• Spectroscopic insensitivity to cold collisions in a two-state mixture of fermions
• Probing Interactions between Ultracold Fermions
• Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions

Cited by in corpus (7)

• Quantum correlations and entanglement in far-from-equilibrium spin systems
• Stability of a trapped atom clock on a chip
• Symmetric micro-wave potentials for interferometry with thermal atoms on a chip
• S-Wave Collisional Frequency Shift of a Fermion Clock
• Quantum engineering of atomic phase-shifts in optical clocks
• Ensemble master equation for a trapped-atom clock with one- and two-body losses
• Effect of trap symmetry and atom-atom interactions on a trapped atom interferometer with internal state labelling