Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 29: Transport: Quantum Coherence and Quantum Information Systems - Part 1

TT 29.9: Vortrag

Donnerstag, 30. März 2006, 12:00–12:15, HSZ 304

Nuclear spin state narrowing via gate–controlled Rabi oscillations in a double quantum dot — •Daniel Klauser, W.A. Coish, and Daniel Loss — Departement of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland

We study spin dynamics for two electrons confined to a double quantum dot under the influence of an oscillating exchange interaction. This leads to driven Rabi oscillations between the |↑↓⟩–state and the |↓↑⟩–state of the two–electron system. The width of the Rabi resonance is proportional to the amplitude of the oscillating exchange. A measurement of the Rabi resonance allows one to narrow the distribution of nuclear spin states and thereby to prolong the spin decoherence time. Further, we study decoherence of the two-electron states due to the hyperfine interaction and give requirements on the parameters of the system in order to initialize in the |↑↓⟩–state and to perform a √SWAP operation with unit fidelity.