München 2004 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 22: Poster Quanteninformation, -kommunikation und -computer

Q 22.7: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Creating and Measuring a coherent superposition in metastable Neon — •Ulrich Schneider, Frank Vewinger, Manfred Heinz, Ruth Garcia Fernandez, and Klaas Bergmann — Fachbereich Physik TU Kaiserslautern

We demonstrate a technique, suitable for neutral atoms in an atomic beam, that allows the preparation of a superposition state in an efficient and robust way with a predetermined relative phase. For the preparation we use the tripod-STIRAP scheme [1] applied to the creation of a coherent superposition of two m_j-states of the metastable state ³P₂ of Neon atoms [2]. We also measure the relative phase of the two m_j-components of the superposition state about 16mm downstream of the preparation region. The measurement is based on the mapping of the relative phase into the population of the excited state as a function of the polarization angle of a probe laser. We report data concerning the superposition of the pairs of levels m_j=+1 and m_j=−1 as well as m_j=−2 and m_j=0.

[1]:R.Unanyan et.al. Opt.Comm. 155, 144-154

[2]:F.Vewinger et al, PRL 91, 213001