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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Single electron-spin memory with a semiconductor quantum dot

Robert J Young1,3, Samuel J Dewhurst1,2, R Mark Stevenson1, Paola Atkinson2, Anthony J Bennett1, Martin B Ward1, Ken Cooper2, David A Ritchie2 and Andrew J Shields1

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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.


PACS

78.67.Hc Quantum dots

42.50.Ct Quantum description of interaction of light and matter; related experiments

42.79.Vb Optical storage systems, optical disks

Subjects

Optics, quantum optics and lasers

Nanoscale science and low-D systems

Dates

Issue 10 (October 2007)

Received 15 June 2007

Published 9 October 2007



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