Rabi oscillations of a quantum dot exciton coupled to acoustic phonons : coherence and population readout
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While the advanced coherent control of qubits is now routinely carried out in low-frequency (gigahertz) systems like single spins, it is far more challenging to achieve for two-level systems in the optical domain. This is because the latter evolve typically in the terahertz range, calling for tools of ultrafast, coherent, nonlinear optics. Using four-wave mixing microspectroscopy, we here measure the optically driven dynamics of a single exciton quantum state confined in a semiconductor quantum dot. In a combined experimental and theoretical approach, we reveal the intrinsic Rabi oscillation dynamics by monitoring both central exciton quantities, i.e., its occupation and the microscopic coherence, as resolved by the four-wave mixing technique. In the frequency domain, this oscillation generates the Autler–Townes splitting of the light-exciton dressed states, directly seen in the four-wave mixing spectra. We further demonstrate that the coupling to acoustic phonons strongly influences the four-wave mixing dynamics on the picosecond time scale, because it leads to transitions between the dressed states.
Wigger , D , Schneider , C , Gerhardt , S , Kamp , M , Höfling , S , Kuhn , T & Kasprzak , J 2018 , ' Rabi oscillations of a quantum dot exciton coupled to acoustic phonons : coherence and population readout ' Optica , vol. 5 , no. 11 , pp. 1442-1450 . https://doi.org/10.1364/OPTICA.5.001442
© 2018, Optical Society of America under the terms of the OSA Open Access Publishing Agreement. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1364/OPTICA.5.001442
DescriptionFunding: European Research Council (ERC) Starting Grant PICSEN (grant no. 306387).
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