Exciton-spin memory with a semiconductor quantum dot molecule

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 m...

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Bibliographic Details
Published in:arXiv.org 2011-05
Main Authors: A Boyer de la Giroday, Skold, N, Stevenson, R M, Farrer, I, Ritchie, D A, Shields, A J
Format: Article
Language:English
Subjects:
Circular polarization
Electron spin
Electrons
Excitons
Holes (electron deficiencies)
Photons
Quantum dots
Single electrons
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1105.3737