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The present paper describes the experimental implementation of a measuringtechnique employing a slowly moving, near resonant, optical standing wave inthe context of trapped ions. It is used to measure several figures of meritthat are important for quantum computation in ion traps and which are otherwisenot easily obtainable. Our technique is shown to offer high precision, and alsoin many cases using a much simpler setup than what is normally used. Wedemonstrate here measurements of i) the distance between two crystalline ions,ii) the Lamb-Dicke parameter, iii) temperature of the ion crystal, and iv) theinterferometric stability of a Raman setup. The exact distance between twoions, in units of standing wave periods, is very important for motionalentangling gates, and our method offers a practical way of calibrating thisdistance in the typical lab situation.

Precision measurements in ion traps using slowly moving standing waves