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Interplay between quantum diffusion and localization in the atom-optics kicked rotor.

S Sagar Maurya, J Bharathi Kannan, Kushal Patel

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    This summary is machine-generated.

    Researchers modified the atom-optics kicked rotor by flipping kick signs, observing enhanced diffusion and localization. This quantum control method offers new ways to manipulate atomic clouds.

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    Area of Science:

    • Atomic physics
    • Quantum dynamics
    • Quantum chaos

    Background:

    • The atom-optics kicked rotor is a model for quantum chaos.
    • Dynamical localization typically halts diffusion in this system.
    • Understanding the transition between diffusion and localization is key.

    Purpose of the Study:

    • To investigate the interplay between localized and diffusive phases in the quantum kicked rotor.
    • To explore a modified atom-optics kicked rotor system with sign-flipped kicks.
    • To achieve quantum control through novel manipulation of atomic clouds.

    Main Methods:

    • Experimental implementation of a modified atom-optics kicked rotor.
    • Flipping the sign of the kick sequence after every M kicks.
    • Introducing free evolution for half the Talbot time between kick sequences.

    Main Results:

    • The modified system exhibits enhanced diffusion followed by asymptotic localization.
    • A balance between localization (kicks) and diffusion (free evolution) was observed.
    • Experimental and numerical simulations showed strong agreement.
    • Evolving states displayed localized, nonexponential wave function profiles.

    Conclusions:

    • The modified kicked rotor provides a new route for quantum control.
    • The interplay between diffusion and localization can be tuned by modifying kick sequences.
    • Nonexponential wave function profiles offer insights into quantum state evolution.