Observation of coherence revival and fidelity saturation in a delta-kicked rotor potential

Abstract

We experimentally investigate the effect of atomic $\delta$-kicked rotor potentials on the mutual coherence between wavepackets in an atom interferometer. The differential action of the kicked rotor degrades the mutual coherence, leading to a reduction of the interferometry fringe visibility; however, when the repetition rate of the kicked rotor is at or near the quantum resonance, we observe revival of matter-wave coherence as the number of kicks increases, resulting in non-vanishing coherence in the large kick number limit. This coherence saturation effect reflects a saturation of fidelity decay due to momentum displacements in deep quantum regime. The saturation effect is accompanied with an invariant distribution of matter-wave coherence under the kicked rotor perturbations.

10 pages, 3 figures. Minor revisions

References in corpus (3)

• Dynamics of Loschmidt echoes and fidelity decay
• Saturation of fidelity in the atom-optics kicked rotor
• Demonstration of perfect coherence preservation for matter-waves perturbed by a delta-kicked rotor

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• Impact of Boundary Conditions on the Double-Kicked Quantum Rotor
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