Exciton-spin memory with a semiconductor quantum dot molecule. (arXiv:1105.3737v1 [quant-ph])

We report on a single photon and spin storage device based on a semiconductor
quantum dot molecule. Optically excited single electron-hole pairs are trapped
within the molecule and their recombination rate is electrically controlled
over three orders of magnitude. Single photons are stored up to 1 microsecond
and read out on a sub-nanosecond timescale. Using resonant excitation, the
circular polarisation of individual photons is transferred into the spin state
of electron-hole pairs with a fidelity above 80%, which does not degrade for
storage times up to the 12.5ns repetition period of the experiment.

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