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

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Ramsay, A. J.
Boyle, S. J.
Godden, T. M.
Kolodka, R. S.
Khatab, A. F. A.
Oliveira, José Brás Barreto de [UNESP]
Skiba-Szymanska, J.
Liu, H. -Y.
Hopkinson, M.
Fox, A. M.

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Pergamon-Elsevier B.V. Ltd


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.



Quantum dots, Spin dynamics, Coherent control

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Solid State Communications. Oxford: Pergamon-Elsevier B.V. Ltd, v. 149, n. 35-36, p. 1458-1465, 2009.