Observation of the Fluorescence Light of Stored Ba+ Ions

Reinhard Iffländer, Guenter Werth

Nivedya Valappol, Klaus Peter Jungmann, Lorenz Willmann +2 more

Thilo Sauter, R. Blatt, Werner Neuhauser +1 more

We demonstrated interruptions of macroscopic duration in a single trapped and cooled Ba+ ions’s 493‐nm fluorescence. They are caused by transitions of the ion into the ‘‘dark’’ 2D5/2 state.—Multiple simultaneous jumps of three ions indicate cooperative interaction with the light.

Reinhard Iffländer, Günther Werth

The observation of D1-fluorescence light from trapped Ba + ions, using a pulsed tunable dye laser as a light source, leads to a sensitive detection of the confined particles. In preparation of an ODR-experiment to determine the ground state hyperfine splitting of the odd isotopes we found the optimum operating point of the trap and measured the average ion energy.

Michael H. Prior, Randall D. Knight

S Gerber, D Rotter, Markus Hennrich +7 more

We observe quantum interference of photons emitted by two continuously laser-excited single ions, independently trapped in distinct vacuum vessels. High contrast two-photon interference is observed in two experiments with different ion species, Ca + and Ba + . Our experimental findings are quantitatively reproduced by Bloch equation calculations. In particular, we show that the coherence of the individual resonance fluorescence light field is determined from the observed interference.