Robust state preparation of a single trapped ion by adiabatic passage

Abstract

We report adiabatic passage experiments with a single trapped ${}^{40}$Ca${}^{+}$ ion. By applying a frequency chirped laser pulse with a Gaussian amplitude envelope we reach a transfer efficiency of 0.990(10) on an optical transition from the electronic ground state S${}_{1/2}$ to the metastable state D${}_{5/2}$. This transfer method is shown to be insensitive to the accurate setting of laser parameters, and therefore is suitable as a robust tool for ion based quantum computing.

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