Dresden 2003 – wissenschaftliches Programm

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SYQI: Quantum information processing in condensed media

SYQI 1: Quantum information processing in condensed media I

SYQI 1.5: Hauptvortrag

Montag, 24. März 2003, 15:00–15:30, HSZ/01

Quantum dots for processing quantum information — •Robert H. Blick — Center for Nanoscience & Sektion Physik, LMU München, 80539 München, Germany

Quantum dots by now offer a well-defined environment for studying quantum physics. Hence, various proposals have been introduced how to integrate these artificial molecules for building quantum computing devices. Crucial for operating such circuits is the realization of wave function coherence established in coupled quantum dots. Consequently, the foremost goal is to devise basic circuits for testing phase coherence and dissipation mechanisms. The avenue we are taking in the course of this work is to study two coupled quantum dots forming a molecular mode which we treat as a quantum bit (qubit). This enables to fully control and engineer the interaction of a qubit with the environment (dephasing) and with other qubits (communication). Dephasing is introduced via the electron-electron interaction, electron-spin and electron-phonon coupling. Naturally, the electron-electron and electron-photon interaction have to be considered as means for communicating, i.e. addressing, the indivivdual qubits.