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A hole spin is a potential solid-state q-bit, that may be more robust againstnuclear spin induced dephasing than an electron spin. Here we propose anddemonstrate the sequential preparation, control and detection of a single holespin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embeddedin a photodiode structure under an applied electric-field. Fast, triggered,initialization of a hole spin is achieved by creating a spin-polarizedelectron-hole pair with a picosecond laser pulse, and in an appliedelectric-field, waiting for the electron to tunnel leaving a spin-polarizedhole. Detection of the hole spin with picosecond time resolution is achieved asecond picosecond laser pulse to probe the positive trion transition, where atrion is created conditional on the hole spin to be detected as a change inphotocurrent. Finally, using this setup we observe a Rabi rotation of thehole-trion transition that is conditional on the hole spin, which for apulse-area of $2\pi$ can be used to impart a phase-shift of $\pi$ between thehole spin states, a non-general manipulation of the hole spin.

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