Coupling quantum dot spins to a photonic crystal nanocavity

We present a method that allows for deterministic coupling of charge-tunable quantum dots to high-Q photonic crystal nanocavity modes. The realization of cavity-mediated coherent coupling of two distant spins is hindered by large fluctuations in quantum dot optical (trion) transition energy and interdot separation. We show that flexible cavity design and gate-voltage-tunable trion transitions in quantum dot molecules can be used to overcome these limitations and to achieve conditional quantum dynamics of two confined spins.