Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 109: Quantum dots and wires: Quantum communication and quantum information science

HL 109.1: Talk

Friday, March 20, 2015, 11:15–11:30, ER 164

Optical Tomography of Electron Spins in (In,Ga)As Quantum Dots — •Janina Schindler¹, Steffen Varwig¹, Alexandre René¹, Sophia Economou², Alex Greilich¹, Dmitri Yakovlev^1,3, Dirk Reuter⁴, Andreas Wieck⁴, Thomas Reinecke², and Manfred Bayer¹ — ¹Experimentelle Physik II, TU Dortmund, D-44221 Dortmund, Germany — ²Naval Research Laboratory, Washington D.C. 20375, USA — ³Ioffe Physical Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ⁴Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Electron spins in quantum dots are considered as a promising candidate for implementing quantum bits in semiconductors. As already has been shown in preceding experiments, their control, manipulation and read-out can be achieved purely optical. For the implementation of quantum gates, two interacting qubits are required. There has already been evidence for interaction between two qubits, which are realized by electron spin ensembles of self-assembled (In,Ga)As quantum dots. To scrutinise the interaction between these ensembles, we perform optical time-resolved pump-probe ellipticity measurements on the spin polarisation. More precisely, we study the time evolution of a spin component along the magnetic field based on optically induced spin rotations to read out all spin-vector components.