Competition between Spin Echo and Spin Self-Rephasing in a Trapped Atom Interferometer

Abstract

We perform Ramsey interferometry on an ultracold 87Rb ensemble confined in an optical dipoletrap. We use a π-pulse set at the middle of the interferometer to restore the coherence of the spinensemble by canceling out phase inhomogeneities and creating a spin echo in the contrast. However,for high atomic densities, we observe the opposite behavior: the π-pulse accelerates the dephasingof the spin ensemble leading to a faster contrast decay of the interferometer. We understand thisphenomenon as a competition between the spin-echo technique and an exchange-interaction drivenspin self-rephasing mechanism based on the identical spin rotation effect. Our experimental data iswell reproduced by a numerical model.

References in corpus (7)

• Continuous Cold-atom Inertial Sensor with $1{\text{nrad.s}}^{-1}$ Rotation Stability
• Mobile quantum gravity sensor with unprecedented stability
• Stability comparison of two absolute gravimeters: optical versus atomic interferometers
• Analysis of dephasing mechanisms in a standing wave dipole trap
• Testing Gravity with Cold-Atom Interferometers
• Coherent collisional spin dynamics in optical lattices
• Observation of the Leggett-Rice effect in a unitary Fermi gas

Cited by in corpus (10)

• Dynamics of quantum information
• Observation of a Transition Between Dynamical Phases in a Quantum Degenerate Fermi Gas
• Dynamical phase transitions in the collisionless pre-thermal states of isolated quantum systems: theory and experiments
• A trapped ultracold atom force sensor with a $\mu$m-scale spatial resolution
• Relaxation of the collective magnetization of a dense 3D array of interacting dipolar S=3 atoms
• Simulation of XXZ Spin Models using Sideband Transitions in Trapped Bosonic Gases
• Observing spin-squeezed states under spin-exchange collisions for a second
• Phase diffusion in trapped-atom interferometers
• Magic density in a self-rephasing ensemble of trapped ultracold atoms
• Quantum correlations protection through spin self-rephasing in 1-D Bose gas