Abstract
We report a measurement of the lifetime of the metastable level in using quantum jumps of a single cold calcium ion in a linear Paul trap. The transition is significant for single-ion optical frequency standards, astrophysical references, and tests of atomic structure calculations. We obtain s from observation of nearly quantum jumps during h. Our result is more precise and significantly larger than previous measurements. Experiments carried out to quantify systematic effects included a study of a previously unremarked source of systematic error, namely, excitation by the broad background of radiation emitted by a semiconductor diode laser. Combining our result with atomic structure calculations yields s for the lifetime of We also use quantum jump observations to demonstrate photon antibunching, and to estimate background pressure and heating rates in the ion trap.
- Received 23 December 1999
DOI:https://doi.org/10.1103/PhysRevA.62.032503
©2000 American Physical Society