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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

Ramsay, AJ; Boyle, SJ; Godden, TM; Kolodka, RS; Khatab, AFA; Oliveira, JBB; ... Skolnick, MS; + view all (2009) Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole. SOLID STATE COMMUN , 149 (35-36) 1458 - 1465. 10.1016/j.ssc.2009.04.043.

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Abstract

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.

Type:Article
Title:Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole
DOI:10.1016/j.ssc.2009.04.043
Keywords:Quantum dots, Spin dynamics, Coherent control, QUANTUM-DOT, ELECTRON
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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