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Q: Fachverband Quantenoptik und Photonik

Q 32: Quantum Information: Concepts and Methods V

Q 32.1: Vortrag

Mittwoch, 8. März 2017, 14:30–14:45, P 2

Fluorescence state detection of single atoms on a non-cycling transition — •Bo Wang, Matthias Körber, Stefan Langenfeld, Olivier Morin, Andreas Neuzner, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748, Garching, Germany

State-selective fluorescence is widely used to readout the internal state of atoms or ions. Applications range from optical clocks to quantum information processing. To reach a high accuracy, many scattered photons are required. Any loss channel leading to a dark state stops the fluorescence and reduces the fidelity. Therefore, standard fluorescence detection is only applicable for a few internal states that can be excited via a cycling transition, like the |⁵ S_1/2, F = 2 ⟩ state in ⁸⁷Rb. We now theoretically and experimentally study schemes for the detection of the |⁵ S_1/2, F = 1 ⟩ state in ⁸⁷Rb for which a cycling transition does not exist. Our schemes are based on cavity-enhanced fluorescence and alternating probe-beam configurations. By optimizing the control sequence, we currently achieve a hyperfine-state-detection fidelity of 96% in 12 µs. Theoretical concepts for further optimization will be presented.