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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.40: Poster

Friday, March 4, 2005, 14:00–18:00, Poster TU C

Continuous measurement of two spin qubits in quantum dots — •Holger Schaefers and Walter T. Strunz — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany

We investigate two electron spin qubits in quantum dots. The spins are measured by separate currents through the dots. Our approach is based on quantum trajectories , widely used in quantum optics, here adapted to describe conditional quantum dot dynamics in a fermionic environment. We use the quantum trajectory approach to simulate the quantum dynamics conditioned on the continuous measurement outcome, here the electron currents through the dots. We investigate counting statistics of the currents with respect to signatures of entanglement of the spins.