Abstract
A single Ba+ ion in a Paul trap is placed at the focus of a high-quality f/1.2 lens, and its fluorescence at 493 nm collimated through this lens is retroreflected by a mirror about 25 cm away, see Fig.1. When the ion and its mirror image overlap, their observation at variable mirror distance shows interference fringes with >70% visibility (Fig.2).
© 2000 IEEE
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