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.

arXiv comment10 pages, 3 figures. Minor revisions

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• Quantum quenches and work distributions in ultra-low-density systems
• Prospects for Precise Measurements with Echo Atom Interferometry
• Measuring the atomic recoil frequency using a perturbative grating-echo atom interferometer
• Pseudo-classical theory for fidelity of nearly resonant quantum rotors
• Detection of avoided crossings by fidelity
• Path integral approach to the quantum fidelity amplitude
• Fidelity for kicked atoms with gravity near a quantum resonance
• Applications of fidelity measures to complex quantum systems
• Improving coherence with nested environments
• Exact Fidelity and Full Fidelity Statistics in Regular and Chaotic Surroundings
• Non-monotonous short-time decay of the Loschmidt echo in quasi-one-dimensional systems
• A generalized fidelity amplitude for open systems
• Resonant transfer of large momenta from finite duration pulse sequences
• Biexponential decay and ultralong coherence of a single qubit
• Matter-wave chaos with a cold atom in a standing-wave laser field
• Fidelity of the near resonant quantum kicked rotor
• Probing two-particle exchange processes in two-mode Bose-Einstein condensates
• Impact of Boundary Conditions on the Double-Kicked Quantum Rotor
• Atom interferometry using wavepackets with constant spatial displacements