Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
Quantum Physics
2009-11-10 v1
Abstract
We present an all-optical implementation of quantum computation using semiconductor quantum dots. Quantum memory is represented by the spin of an excess electron stored in each dot. Two-qubit gates are realized by switching on trion-trion interactions between different dots. State selectivity is achieved via conditional laser excitation exploiting Pauli exclusion principle. Read-out is performed via a quantum-jump technique. We analyze the effect on our scheme's performance of the main imperfections present in real quantum dots: exciton decay, hole mixing and phonon decoherence. We introduce an adiabatic gate procedure that allows one to circumvent these effects, and evaluate quantitatively its fidelity.
Cite
@article{arxiv.quant-ph/0304044,
title = {Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence},
author = {T. Calarco and A. Datta and P. Fedichev and E. Pazy and P. Zoller},
journal= {arXiv preprint arXiv:quant-ph/0304044},
year = {2009}
}