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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
- Univ Sheffield
- Universidade Estadual Paulista (UNESP)
- Engineering and Physical Sciences Research Council (EPSRC)
- QIPIRC UK
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
- University of Cairo
- EPSRC UK: GR/S76076
- 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.
- Solid State Communications. Oxford: Pergamon-Elsevier B.V. Ltd, v. 149, n. 35-36, p. 1458-1465, 2009.
- Pergamon-Elsevier B.V. Ltd
- Quantum dots
- Spin dynamics
- Coherent control
- Acesso restrito
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