Abstract: I will discuss and demonstrate coherent optical initialization, full control and readout of two spin qubits in semiconductor quantum dots:

the bright and the dark excitons.

Both qubits, the short lived bright and the long lived dark excitons are deterministically, on demand initiated in a pure state by one optical pulse.

 Both are fully controlled by picosecond optical pulses, which are several orders of magnitude shorter than the life and coherence time of the dark exciton.

Our demonstrations do not require externally applied magnetic field and they establish that these integer spin two level systems form excellent solid state matter qubits with some advantages over the half integer spin qubit: the electron and the  hole, separately.

Since semiconductor nanostructures dovetail with contemporary technologies of electronic and photonic components these spin qubits may have implications on implementations of quantum technologies.

Work done with Ido Schwartz, Emma Shmidgall, Liron Gantz, and Dan Cogan