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The spin of a charged semiconductor quantum dot (QD) coupled to an opticalcavity is a promising candidate for high fidelity spin-photon interfaces; thecavity selectively modifies the decay rates of optical transitions such thatspin initialisation, manipulation, and readout are all possible in a singlemagnetic field geometry. By performing cavity QED calculations, we show that acavity with a single, linearly-polarised mode can simultaneously support bothhigh-fidelity optical spin initialisation and readout in a single, in-plane(Voigt geometry) magnetic field. Furthermore, we demonstrate that single modecavities always outperform bi-modal cavities in experimentally favourabledriving regimes. Our analysis, when combined with established methods ofcontrol in a Voigt geometry field, provides optimal parameter regimes forhigh-fidelity initialisation and readout, and coherent control in both cavityconfigurations, providing insights for the design and development of QDspin-photon interfaces.

Optical Spin Initialisation and Readout with a Cavity-Coupled Quantum Dot in an In-Plane Magnetic Field