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We present a solid-state implementation of an all-optical
spin-based quantum computer. Our proposal for a quantum-computing
device is based on the spin degrees of freedom of electrons
confined in semiconductor quantum dots, thus benefitting from
relatively long coherence times. Combining Pauli blocking effects
with properly tailored ultrafast laser pulses, we obtain
sub-picosecond spin-dependent switching of the Coulomb
interaction, which is the essence of our gating operations. This
allows us to realize fast quantum gates which do not
translate into fast decoherence times and pave the way for an
all-optical spin-based quantum computer
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