Issue Europhys. Lett. Volume 62, Number 2, April 2003 Page(s) 175 - 181 Section General DOI 10.1209/epl/i2003-00343-4

DOI: 10.1209/epl/i2003-00343-4
Europhys. Lett., 62 (2) , pp. 175-181 (2003)

Spin-based optical quantum computation via Pauli blocking in semiconductor quantum dots

E. Pazy^{1, 2}, E. Biolatti^{2, 3, 4}, T. Calarco^{5, 6}, I. D'Amico^{2, 3}, P. Zanardi^{2, 3}, F. Rossi^{2, 3, 4} and P. Zoller<sup>5

1</sup>  Department of Physics, Ben-Gurion University of the Negev Beer-Sheva 84105, Israel
²  Institute for Scientific Interchange (ISI) - I-10133 Torino, Italy
³  Istituto Nazionale per la Fisica della Materia (INFM) - Torino, Italy
⁴  Dipartimento di Fisica, Politecnico di Torino - I-10129 Torino, Italy
⁵  Institute for Theoretical Physics, University of Innsbruck A-6020 Innsbruck, Austria
⁶  ECT* - I-38050 Villazzano (TN), Italy

(Received 31 October 2002; accepted in final form 24 February 2003)

Abstract
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.

PACS
03.67.Lx - Quantum computation.
71.35.Cc - Intrinsic properties of excitons; optical absorption spectra.
73.21.La - Quantum dots.

© EDP Sciences 2003

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