Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 52: Quanteninformation III
Q 52.7: Vortrag
Dienstag, 8. März 2005, 18:30–18:45, HU Audimax
Manipulation of Nuclear Spins in Single Electron Quantum Dots — •Henning Christ1, Belen Paredes1, Geza Giedke2, Jacob Taylor3, Peter Zoller4, Micha Lukin 3, Atac Imamoglu2, and Ignacio Cirac1 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Institut für Quantenelektronik, ETH Zürich, Switzerland — 3Department of Physics, Harvard University, USA — 4Institut für Theoretische Physik, Universität Innsbruck, Austria
The long coherence times of nuclear spins have lead to various proposals for quantum information processing incorporating them. Thus it is desirable to have control over nuclear spins. We propose a new way of manipulating the collective state of a mesoscopic nuclear ensemble via the hyperfine interaction in a single electron quantum dot. It is demonstrated that the excitations created by a hyperfine-mediated flip-flop-process with the electron have bosonic character. We show that the dynamics is governed by a Jaynes-Cummings-like Hamiltonian which has been studied in quantum optics for decades and served as the theoretical basis for many spectacular experiments. Conditions for the validity of the bosonic approximation are derived and we specify the corrections to it. Noting the success of the transfer of this model to the area of superconducting devices, we illustrate the power of our approach for quantum dots by considering a novel proposal for quantum information processing and demonstrating squeezing of the collective nuclear spin state.