Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: TR: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)
TT 30.6: Vortrag
Mittwoch, 16. März 2011, 12:00–12:15, HSZ 03
Nuclear spin cooling using Overhauser field selective coherent population trapping — Eric Matthias Kessler1, Mena Issler2, •Géza Giedke1, Susanne Yelin3, Ignacio Cirac1, Mikhail Lukin4, and Atac Imamoglu2 — 1Max-Planck Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany — 2Institute of Quantum Electronics, ETH-Zürich, CH-8093 Zürich, Switzerland — 3Department of Physics, University of Connecticut 2152 Hillside Road, U-3046 Storrs, CT 06269-3046, USA — 4Department of Physics, Harvard University, Cambridge, MA 02138, USA
We show that a quantum interference effect in optical absorption from two electronic spin states of a solid-state emitter can be used to prepare the surrounding environment of nuclear spins in well-defined states, thereby suppressing electronic spin dephasing. The coupled electron-nuclei system evolves into a coherent population trapping state by optical-excitation-induced nuclear spin diffusion for a broad range of initial optical detunings. The spectroscopic signature of this evolution where the single-electron strongly modifies its environment is a drastic broadening of the dark resonance in optical absorption experiments. The large difference in electronic and nuclear timescales allows to verify the preparation of nuclear spins in the desired state.