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. 2022 Feb 8;13:748. doi: 10.1038/s41467-022-28328-2

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Sample layer structure and geometry used (not to scale). A single layer of InAs quantum dots is grown on an InGaAs metamorphic buffer (MMB) layer allowing for emission in the C-band telecom window. Bottom distributed Bragg reflectors (DBR, 20 pairs) and air top interface nominally form a 3-λ cavity for increased photon collection efficiency. An external magnetic field (B) is applied along the x-axis (Voigt geometry). Emission collection and excitation is performed along the z-axis. Insets: orientation (x, y, z) and polarization convention (H, V) used. b Trion level structure in Voigt magnetic field with radiative transitions selection rules, as used in the experiment. c Bloch sphere representing the spin-qubit. d Color-coded map of the trion photoluminescence spectra as a function of detected polarization angle at 3 T magnetic field in Voigt configuration. e Trion photoluminescence spectra at B = 3 T at horizontal (H) and vertical (V) linear polarization.