Exciton-spin memory with a semiconductor quantum dot molecule

Details Exciton-spin memory with a semiconductor quantum dot molecule Exciton-spin memory with a semiconductor quantum dot molecule

2011-05-18

arxiv.org/abs/1105.3737v1

Phys. Rev. Lett. 106, 216802 (2011)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

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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