Ultrafast initialization and QND-readout of a spin qubit via control of nanodot-vacuum coupling

Details Ultrafast initialization and QND-readout of a spin qubit via control of nanodot-vacuum coupling Ultrafast initialization and QND-readout of a spin qubit via control of nanodot-vacuum coupling

2004-08-06

arxiv.org/abs/cond-mat/0408148v2

Phys. Rev. B 72, 081306(R), (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages 3 figures

Scientific paper

10.1103/PhysRevB.72.081306

Ultrafast initialization enables fault-tolerant processing of quantum information while QND readout enables scalable quantum computation. By spatially assembling photon resonators and wave-guides around an n-doped nanodot and by temporally designing optical pump pulses, an efficient quantum pathway can be established from an electron spin to a charged exciton to a cavity photon and finally to a flying photon in the waveguide. Such control of vacuum-nanodot coupling can be exploited for ultrafast initialization and QND readout of the spin, which are particularly compatible with the optically driven spin quantum computers.

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