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

Details Spin-based optical quantum gates via Pauli blocking in semiconductor quantum dots Spin-based optical quantum gates via Pauli blocking in semiconductor quantum dots

2001-09-19

arxiv.org/abs/cond-mat/0109337v3

Europhys. Lett. 62 2003 175

Physics

Condensed Matter

14 Pages RevTeX, 3 eps figures included

Scientific paper

We present a solid-state implementation of ultrafast conditional quantum gates. Our proposal for a quantum-computing device is based on the spin degrees of freedom of electrons confined in semiconductor quantum dots, thus benefiting from relatively long decoherence times. More specifically, combining Pauli blocking effects with properly tailored ultrafast laser pulses, we are able to obtain sub-picosecond spin-dependent switching of the Coulomb interaction, which is the essence of our conditional phase-gate proposal. This allows us to realize {\it a fast two qubit gate which does not translate into fast decoherence times} and paves the road for an all-optical spin-based quantum computer.

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