Wave packet dynamics of an atomic ion in a Paul trap

A. Hashemloo, C. M. Dion () and G. Rahali
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A. Hashemloo: Department of Physics Umeå University SE-901 87 Umeå, Sweden
C. M. Dion: Department of Physics Umeå University SE-901 87 Umeå, Sweden
G. Rahali: Department of Physics Umeå University SE-901 87 Umeå, Sweden†Department of Physics Jazan University Jazan, Kingdom of Saudi Arabia

International Journal of Modern Physics C (IJMPC), 2016, vol. 27, issue 02, 1-21

Abstract: Using numerical simulations of the time-dependent Schrödinger equation, we study the full quantum dynamics of the motion of an atomic ion in a linear Paul trap. Such a trap is based on a time-varying, periodic electric field and hence corresponds to a time-dependent potential for the ion, which we model exactly. We compare the center-of-mass motion with that obtained from classical equations of motion, as well as to results based on a time-independent effective potential. We also study the oscillations of the width of the ion’s wave packet, including close to the border between stable (bounded) and unstable (unbounded) trajectories. Our results confirm that the center-of-mass motion always follows the classical trajectory, that the width of the wave packet is bounded for trapping within the stability region, and therefore that the classical trapping criterion is fully applicable to quantum motion.

Keywords: Paul trap; atomic ion; wave packet; time-dependent Schrödinger equation; stability (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0129183116500145

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