Optical preparation of nuclear spin bath for enhancing single electron spin coherence time in a quantum dot

36

2009-09-18

923352

Optical preparation of nuclear spin bath for enhancing single electron spin coherence time in a quantum dot

electron spin in quantum dot, inhomogeneous broadening, nuclear state preparation, optical control in quantum dot

Physics,Materials Sciences

Physical Sciences (P)

HKU 706309P

General Research Fund (GRF)

2009

Completed

1) Investigate the possible actions on the nuclear spin bath when the electronic states in a semiconductor quantum dot is excited and manipulated by optical fields. Find a unified treatment of the coupled interplay between the nuclear spin bath, the electronic states, and the optical fields. 2) Investigate the hyperfine interaction between the nuclear spin and the heavy-hole constitution of the charged exciton state in the relevant quantum dot geometries and experimental setups. Understand the possible actions on nuclear spin baths from hole spin, and explore the potential of this new ingredient on nuclear spin control. 3) Explore control schemes that can prepare the nuclear spin bath from the initial thermal distribution into a non-thermal distribution with narrowed inhomogeneous broadening, for enhancing the electron spin coherence time in semiconductor quantum dot.