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Towards coherent optical control of a single hole spin: rabi rotation of a trion conditional on the spin state of the hole \ud \ud

By A.J. Ramsay, S.J. Boyle, T.M. Godden, R.S. Kolodka, A.F.A. Khatab, J.B.B. Oliveira, J. Skiba-Szymanska, H.Y. Liu, M. Hopkinson, A.M. Fox and M.S. Skolnick


A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential preparation, control and detection of a single hole spin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embedded in a photodiode structure under an applied electric field. Fast, triggered, initialization of a hole spin is achieved by creating a spin-polarized electron-hole pair with a picosecond laser pulse, and in an applied electric field, waiting for the electron to tunnel leaving a spin-polarized hole. Detection of the hole spin with picoseconds time resolution is achieved using a second picosecond laser pulse to probe the positive trion transition, where a trion is created conditional on the hole spin being detected as a change in photocurrent. Finally, using this setup we observe a Rabi rotation of the hole-trion transition that is conditional on the hole spin, which for a pulse area of 2 pi can be used to impart a phase shift of pi between the hole spin states, a non-general manipulation of the hole spin. (C) 2009 Elsevier Ltd. All rights reserved

Publisher: Elsevier
Year: 2009
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