Quantum Computing with Electron Spins in Quantum Dots

Details Quantum Computing with Electron Spins in Quantum Dots Quantum Computing with Electron Spins in Quantum Dots

2002-07-10

arxiv.org/abs/quant-ph/0207059v1

Physics

Quantum Physics

to be published in "Quantum Computing and Quantum Bits in Mesoscopic Systems", Kluwer Academic Plenum Publishers (due Dec. 200

Scientific paper

We present a set of concrete and realistic ideas for the implementation of a small-scale quantum computer using electron spins in lateral GaAs/AlGaAs quantum dots. Initialization is based on leads in the quantum Hall regime with tunable spin-polarization. Read-out hinges on spin-to-charge conversion via spin-selective tunneling to or from the leads, followed by measurement of the number of electron charges on the dot via a charge detector. Single-qubit manipulation relies on a microfabricated wire located close to the quantum dot, and two-qubit interactions are controlled via the tunnel barrier connecting the respective quantum dots. Based on these ideas, we have begun a series of experiments in order to demonstrate unitary control and to measure the coherence time of individual electron spins in quantum dots.

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