| Abstract: | Methods and apparatus of quantum information processing using quantum
dots are provided. Electrons from a 2DEG are confined to the quantum dots
and subjected to a magnetic field having a component directed parallel to
the interface. Due to interfacial asymmetries, there is created an
effective magnetic field that perturbs the energies of the spin states
via an interfacial spin-orbit (SO) interaction. This SO interaction is
utilized to controllably produce rotations of the electronic spin state,
such as X-rotations of the electronic spin state in a double quantum dot
(DQD) singlet-triplet (ST) qubit. The desired state rotations are
controlled solely by the use of electrical pulses. |