Optical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths

Łukasz Dusanowski (), Cornelius Nawrath, Simone L. Portalupi, Michael Jetter, Tobias Huber, Sebastian Klembt, Peter Michler and Sven Höfling
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Łukasz Dusanowski: University of Würzburg
Cornelius Nawrath: University of Stuttgart
Simone L. Portalupi: University of Stuttgart
Michael Jetter: University of Stuttgart
Tobias Huber: University of Würzburg
Sebastian Klembt: University of Würzburg
Peter Michler: University of Stuttgart
Sven Höfling: University of Würzburg

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Solid-state quantum emitters with manipulable spin-qubits are promising platforms for quantum communication applications. Although such light-matter interfaces could be realized in many systems only a few allow for light emission in the telecom bands necessary for long-distance quantum networks. Here, we propose and implement an optically active solid-state spin-qubit based on a hole confined in a single InAs/GaAs quantum dot grown on an InGaAs metamorphic buffer layer emitting photons in the C-band. We lift the hole spin-degeneracy using an external magnetic field and demonstrate hole injection, initialization, read-out and complete coherent control using picosecond optical pulses. These results showcase a solid-state spin-qubit platform compatible with preexisting optical fiber networks.

Date: 2022
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DOI: 10.1038/s41467-022-28328-2

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