Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.48: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Highly efficient sub-microsecond Zeeman-state readout of Rb87 via state-selective ionization — •Kai Redeker1, Norbert Ortegel1, Lea Gérard1, Michael Krug1, Julian Hofmann1, Florian Henkel1, Wenjamin Rosenfeld1,2, Markus Weber1, and Harald Weinfurter1,2 — 1Department für Physik, LMU München, Schellingstraße 4, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching
Future applications in quantum information technology such as quantum repeaters and atomic quantum computers heavily rely on the capability to read out qubits fast and efficiently. Here we present a readout scheme for a qubit encoded in Zeeman-states of a single Rb87 atom that fulfills these requirements. It is based on a state-selective photo-ionization of the atom and subsequent detection of the ionization fragments.
The readout starts by mapping a selected superpostion of two Zeeman-states onto a superpostion of two hyperfine levels using a STIRAP transfer sequence. The atom is then hyperfine-state selectively ionized and the produced electron and ion are collected using two opposing channel-electron mulitpliers (CEM's). The whole process takes less than 1 microsecond and the overall efficiency of the CEM's to detect at least one of the ionization fragments was found to be above 99%.We show data on the speed and precision of the photo-ionization process, measurements of the absolute detection efficiencies of the CEM's as well as progress towards integrating the CEM's into a single atom trap setup.