Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 67: Quanteninformation IV

Q 67.5: Talk

Wednesday, March 9, 2005, 12:00–12:15, HU 2002

Spin conversion rates in quantum dots due to magnetic dipolar interactions — •Wolfgang Häusler and Peter Hänggi — Institut für Physik, Universität Augsburg, Universitätsstr. 1, D-86135 Augsburg

We investigate the decay of coupled electron spins in quantum dots or arrays of quantum dots as a result of the dipolar interaction between the spin magnetic moments. In the absence of both, spin orbit coupling and interactions with nuclear spins, this is the only spin destabilizing mechanism which, for fundamental reasons, cannot be removed by design. Though non-vanishing, this decay rate is found to be considerably smaller than the ones considered usually due to one of the above two mechanisms. We find even particular circumstances under which spin states decay at most to quartic order in the dipolar interaction, suggesting their z-components for the use as very robust qbits.

We acknowledge partial support by the Deutsche Forschungsgemeinschaft through SFB 631.