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Optical quantum gates with semiconductor nanostructures
Author(s) -
Biolatti Eliana,
Iotti Rita C.,
Zanardi Paolo,
Rossi Fausto
Publication year - 2001
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/1097-007x(200101/02)29:1<137::aid-cta138>3.0.co;2-t
Subject(s) - quantum computer , semiconductor , physics , realization (probability) , optoelectronics , qubit , ultrashort pulse , picosecond , quantum decoherence , quantum , electronic engineering , quantum mechanics , laser , engineering , mathematics , statistics
An all optical implementation of quantum information processing with semiconductor macroatoms is presented. Our quantum hardware consists of an array of semiconductor quantum dots and the computational degrees of freedom, i.e. the qubits, are energy‐selected interband optical transitions. The proposed quantum‐computing scheme exploits exciton–exciton interactions driven by ultrafast sequences of multi‐colour 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. Moreover, the fully‐optical character of the proposed gating scheme makes it an ideal candidate for the realization of all‐optical computing networks. Copyright © 2001 John Wiley & Sons, Ltd.