Fast high fidelity hole spin initialization in a single InGaAs quantum dot

摘要

We demonstrate fast initialization of a single hole spin captured in anInGaAs quantum dot with a fidelity F>99% by applying a magnetic field parallelto the growth direction. We show that the fidelity of the hole spin, preparedby ionization of a photo-generated electron-hole pair, is limited by theprecession of the exciton spin due to the anisotropic exchange interaction.