Dresden 2011 – scientific programme

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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: Talk

Wednesday, March 16, 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.