Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.15: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Dynamics of a doubly Monitored Charge Qubit — •Christian Nietner, Gernot Schaller, Christina Pöltl, and Tobias Brandes — TU Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, 10623 Berlin

We investigate the electronic transport through two parallel double quantum dots coupled via a perpendicularly aligned charge qubit. In our model, the presence of the qubit leads to a modification of the intrinsic tunnel amplitudes of each double quantum dot. Specifically, the two charge configurations of the qubit are associated with a suppression of the electronic tunneling in the respective double quantum dot. We study the influence of the qubit on the electronic steady state currents through the system. To this end we use a Born-Markov-Secular quantum master equation for the system and apply a full counting statistics ansatz. The obtained currents show signatures of the qubit for all bias regimes. Conversely, the stationary qubit state may be tuned and even rendered pure by applying suitable voltages.