Special Condensed Matter Seminar

William Coish
Basel

Tuesday, January 23, 2007 Note different date, time and place
4:00 pm in SPL 3rd Floor Lounge

Fine-tuning the dynamics of electron spins in quantum dots

Abstract: As shown in several recent experiments, the decoherence of electron spins confined to GaAs quantum dots is dominated by the contact hyperfine interaction with nuclear spins in the host material. Understanding and controlling this decoherence mechanism is of central importance to proposals for information processing with electron spins and is of significant fundamental interest as a decoherence model that is complimentary to models based on bosonic environments. In this talk I will describe work done to understand electron spin dynamics in single and double quantum dots in the presence of hyperfine coupling and how the decay process may be controlled by measuring the environment. I will also show how arbitrary coherent rotations could be performed experimentally on a single electron spin with high fidelity, even in the presence of strong environmental coupling mechanisms including the hyperfine interaction.