Nonexponential Decoherence and Subdiffusion in Atom-Optics Kicked Rotor

Physical Review Letters
Sumit SarkarM S Santhanam

Abstract

Quantum systems lose coherence upon interaction with the environment and tend towards classical states. Quantum coherence is known to exponentially decay in time so that macroscopic quantum superpositions are generally unsustainable. In this work, slower than exponential decay of coherences is experimentally realized in an atom-optics kicked rotor system subjected to nonstationary Lévy noise in the applied kick sequence. The slower coherence decay manifests in the form of quantum subdiffusion that can be controlled through the Lévy exponent. The experimental results are in good agreement with the analytical estimates and numerical simulations for the mean energy growth and momentum profiles of an atom-optics kicked rotor.

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Citations

Jun 4, 2019·The Review of Scientific Instruments·Chetan VishwakarmaUmakant D Rapol
Jan 23, 2020·Physical Review. E·Sanku PaulUmakant Rapol
Sep 30, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Wen-Yuan Wang, Wen-Lei Zhao

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