Abstract:

The spin of an electron confined in a semiconductor quantum dot is very well isolated from the environment. That is why it is a perspective candidate for the realization of a quantum bit. However, the qubit isolation goes hand in hand with the manipulation being not easy and vice versa -- a qubit which is easy to manipulate is usualy hard to isolate from the environmental noise. I will discuss the isolation (quantified by the relaxation time) and the manipulation (by resonant electromagnetic field) of the electron spin qubit and show that both these are extremely sensitive to spin-orbit interaction. I will show how the anisotropy of the spin-orbit interaction can be exploited with the goal to keep the relaxation low and the manipulating field influence high.
 
 
  Return