Exciton-spin memory with a semiconductor quantum dot molecule

Abstract

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.

4 pages, 4 figures

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• Photonic quantum technologies
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• Evolution of entanglement within classical light states
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• Bright electrically controllable quantum-dot-molecule devices fabricated by in-situ electron-beam lithography
• Entanglement Dynamics of Molecular Exciton States in Coupled Quantum Dots
• Tunneling induced dark states and controllable fluorescence spectrum in quantum-dot molecules
• Optical signatures of spin dependent coupling in semimagnetic quantum dot molecules
• Hybrid acousto-optical spin control in quantum dots