Transforming light polarization into matter-spin-qubits and back, using single, semiconductor quantum dots
We demonstrate experimentally that light polarization can be directly transformed into the spin of resonantly excited correlated electron hole pairs ('bright' and 'dark' excitons) in semiconductor quantum dots. We show how a polarized picosecond pulse “writes” the exciton’s spin polarization and how a second pulse “reads” it. We also demonstrate manipulation of the spin state from any given point on the surface of its Bloch sphere, to any desired point, using a third, single intermediate pulse.
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