Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: TR: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)

TT 34.6: Talk

Wednesday, March 16, 2011, 15:15–15:30, HSZ 03

Feedback Control of a Transport Charge Qubit — •Christina Pöltl, Clive Emary, and Tobias Brandes — TU Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, D-10623 Berlin, Germany

We study a simple feedback control operation acting on a transport double quantum dot instantaneously after an electron jumps into the dot. A qubit system such as a double quantum dot is affected by decoherence once it is coupled to an environment. An electronic transport system always experiences decoherence and the projection on the qubit-state relaxes into a statistical mixture. However, we show that feedback qubit rotations enable the generation of pure states as steady states of the system.

We use a master equation jump approach in order to include the feedback which allows us to investigate the steady state as well as the full counting statistics of the transport qubit with feedback.