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Phys Rev Lett. 2003 May 23;90(20):206802. Epub 2003 May 20.

High-finesse optical quantum gates for electron spins in artificial molecules.

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  • 1INFM-S3 and Dipartimento di Fisica, Universit√† di Modena e Reggio Emilia, Via Campi 213/A, 41100 Modena, Italy.


A doped semiconductor double-quantum-dot molecule is proposed as a qubit realization. The quantum information is encoded in the electron spin, thus benefiting from the long relevant decoherence times; the enhanced flexibility of the molecular structure allows one to map the spin degrees of freedom onto the orbital ones and vice versa and opens the possibility for high-finesse (conditional and unconditional) quantum gates by means of stimulated Raman adiabatic passages.

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