Quantum-Information Processing with Semiconductor Macroatoms

Authors:
  • EBEliana Biolatti
    Eliana Biolatti
  • RIRita C. Iotti
    Rita C. Iotti
  • PZPaolo Zanardi
    Paolo Zanardi
  • FRFausto Rossi
    Fausto Rossi
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Abstract
An all optical implementation of quantum information processing with semiconductor macroatoms is proposed. Our quantum hardware consists of an array of semiconductor quantum dots and the computational degrees of freedom are energy-selected interband optical transitions. The proposed quantum-computing strategy exploits exciton-exciton interactions driven by ultrafast sequences of multi-color laser pulses. Contrary to existing proposals based on charge excitations, the present all-optical implementation does not require the application of time-dependent electric fields, thus allowing for a sub-picosecond, i.e. decoherence-free, operation time-scale in realistic state-of-the-art semiconductor nanostructures.