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The dark exciton state in semiconductor quantum dots constitutes a long-livedsolid-state qubit which has the potential to play an important role inimplementations of solid-state based quantum information architectures. In thiswork, we exploit deterministically fabricated QD microlenses with enhancedphoton extraction, to optically prepare and readout the dark exciton spin andobserve its coherent precession. The optical access to the dark exciton isprovided via spin-blockaded metastable biexciton states acting as heraldingstate, which are identified deploying polarization-sensitive spectroscopy aswell as time-resolved photon cross-correlation experiments. Our experimentsreveal a spin-precession period of the dark exciton of $(0.82\pm0.01)\,$nscorresponding to a fine-structure splitting of $(5.0\pm0.7)\,\mu$eV between itseigenstates $\left|\uparrow\Uparrow\pm\downarrow\Downarrow\right\rangle$. Byexploiting microlenses deterministically fabricated above pre-selected QDs, ourwork demonstrates the possibility to scale up implementations of quantuminformation processing schemes using the QD-confined dark exciton spin qubit,such as the generation of photonic cluster states or the realization of asolid-state-based quantum memory.

Accessing the dark exciton spin in deterministic quantum-dot microlenses