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Single electron-spin memory with a semiconductor quantum dot

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Article number365
<mark>Journal publication date</mark>9/10/2007
<mark>Journal</mark>New Journal of Physics
Number of pages7
<mark>Original language</mark>English


We show storage of the circular polarization of an optical field, transferring it to the spin-state of an individual electron confined in a single semiconductor quantum dot. The state is subsequently read out through the electronically-triggered emission of a single photon. The emitted photon shares the same polarization as the initial pulse but has a different energy, making the transfer of quantum information between different physical systems possible. With an applied magnetic field of 2 T, spin memory is preserved for at least 1000 times more than the exciton's radiative lifetime.