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Spin-Based All-Optical Quantum Computation With Quantum Dots: Understanding and Suppressing Decoherence

Published

Author(s)

Tommaso Calarco, S K. Datta, P Fedichev, E Pazy, W.H. Zoller

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 bi-excitonic 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 to circumvent all of these effects, and evaluate quantitatively its fidelity.
Citation
Physical Review A (Atomic, Molecular and Optical Physics)

Keywords

decoherence, quantum dots, quantum information, spintronics

Citation

Calarco, T. , Datta, S. , Fedichev, P. , Pazy, E. and Zoller, W. (2008), Spin-Based All-Optical Quantum Computation With Quantum Dots: Understanding and Suppressing Decoherence, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed June 14, 2024)

Issues

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Created October 16, 2008