Trapped-Ion State Detection through Coherent Motion

Abstract

We demonstrate a general method for state detection of trapped ions that can be applied to a large class of atomic and molecular species. We couple a "spectroscopy" ion (Al+) to a "control" ion (Mg+) in the same trap and perform state detection through off-resonant laser excitation of the spectroscopy ion that induces coherent motion. The motional amplitude, dependent on the spectroscopy ion state, is measured either by time-resolved photon counting, or by resolved sideband excitations on the control ion. The first method provides a simplified way to distinguish "clock" states in Al+, which avoids ground state cooling and sideband transitions. The second method reduces spontaneous emission and optical pumping on the spectroscopy ion, which we demonstrate by nondestructively distinguishing Zeeman sublevels in the 1S0 ground state of Al+.

5 pages, 3 figures. Replaced with published version

References in corpus (3)

• Observation of the 1S0 - 3P0 clock transition in 27Al+
• Ultrasensitive force and displacement detection using trapped ions
• Phase-coherent detection of an optical dipole force by Doppler velocimetry

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