Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 107: Quantum Information Systems II (organized by HL)
TT 107.5: Vortrag
Freitag, 4. April 2014, 10:30–10:45, POT 151
Mapping the D1-transition of Caesium by dressed-state resonance fluorescence from a single (In,Ga)As quantum dot — •Sven M. Ulrich1, Markus Oster1, Michael Jetter1, Alban Urvoy2, Robert Löw2, Tilmann Pfau2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 25. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
Hybrid quantum systems combining semiconductor quantum dots (QDs) and atomic vapors promise interesting applications in quantum information technology. Recent research in this field has explored the resonant coupling between single GaAs QDs and Rubidium gas to generate e.g. frequency-stabilized non-classical emission (∼ 780 nm) as well as slow light for qubit storage/retrieval operations.
As an alternative hybrid approach we use a cw laser-driven single (In,Ga)As QD (4 K) in the "dressed state" resonance fluorescence (RF) regime to address the D1 transitions of atomic Caesium (Cs) vapor (300 K). QD-atom resonance is achieved by tuning the frequency of the dressing laser close to the QD ground state ν0 ≈ 335.116 THz (894.592 nm) and shifting the narrow-band center and side channels of the QD Mollow triplet. Using this laser frequency controlled QD probe light for absorption measurements allows to precisely identify all four Cs hyperfine-split transitions. Therefore, narrow-band (In,Ga)As QD RF is demonstrated as suitable to optically address individual channels of the D1 quadruplet without magnetic field or electric field tuning.