Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: Transport: Quantum Coherence and Quantum Information Systems
TT 9.11: Talk
Monday, February 25, 2008, 17:00–17:15, H 2053
Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line — •Mircea Trif1, Vitaly N. Golovach2, and Daniel Loss3 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland. — 2Department of Physics, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 Munich, Germany. — 3Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
We study theoretically electron spins in nanowire quantum dots placed inside a transmission line resonator. Because of the spin-orbit interaction, the spins couple to the electric component of the resonator electromagnetic field and enable coherent manipulation, storage, and read-out of quantum information in an all-electrical fashion. Coupling between distant quantum-dot spins, in one and the same or different nanowires, can be efficiently performed via the resonator mode either in real time or through virtual processes. For the latter case we derive an effective spin-entangling interaction and suggest means to turn it on and off. We consider both transverse and longitudinal types of nanowire quantum-dots and compare their manipulation timescales against the spin relaxation times. For this, we evaluate the rates for spin relaxation induced by the nanowire vibrations (phonons) and show that, as a result of phonon confinement in the nanowire, this rate is a strongly varying function of the spin operation frequency and thus can be drastically reduced compared to lateral quantum dots in GaAs. Our scheme is a step forward to the formation of hybrid structures where qubits of different nature can be integrated in a single device.