Heidelberg 2015 – wissenschaftliches Programm
A 40.7: Vortrag
Freitag, 27. März 2015, 12:30–12:45, B/SR
Quantum Logic Spectroscopy of Molecular Ions — •Fabian Wolf1, Jan C. Heip1, Yong Wan1, Florian Gebert1, and Piet O. Schmidt1,2 — 1QUEST Institut, Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Germany
The rapid development in laser cooling and coherent state manipulation over the past decades has enabled exquisite control over the internal and external degrees of freedom of various species of atomic ions. The same techniques cannot be easily applied to molecular ions because of their rich internal level structure. On the other hand, ultracold molecular ions lend themselves for a number of novel applications, ranging from cold chemistry to tests of fundamental theories.
We propose to prepare a translationally cold molecular ion in a specific ro-vibrational state by employing the quantum logic technique  in which a laser-cooled atomic ion is simultaneously trapped with a single molecular ion. The cooling of the external degrees of freedom of the molecular ion is achieved via sympathetic cooling by the sideband-cooled atomic ion, while the preparation of its internal state is achieved via a quantum-non-demolition measurement (QNDM).
By analyzing the signal obtained from QNDM we can extract spectroscopic information about the X1Σ+→A1Σ+ transition.
 Schmidt et al., Science 309, 749 (2005)