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The quest for an integrated quantum optics platform has motivated the fieldof semiconductor quantum dot research for two decades. Demonstrations ofquantum light sources, single photon switches, transistors, and spin-photoninterfaces have become very advanced. Yet the fundamental problem that everyquantum dot is different prevents integration and scaling beyond a few quantumdots. Here, we address this challenge by patterning strain via local phasetransitions to selectively tune individual quantum dots that are embedded in aphotonic architecture. The patterning is implemented with in operando lasercrystallization of a thin HfO$_{2}$ film "sheath" on the surface of a GaAswaveguide. Using this approach, we tune InAs quantum dot emission energies overthe full inhomogeneous distribution with a step size down to the homogeneouslinewidth and a spatial resolution better than 1 $\mu $m. Using thesecapabilities, we tune multiple quantum dots into resonance within the samewaveguide and demonstrate a quantum interaction via superradiant emission fromthree quantum dots.

Scalable in operando strain tuning in nanophotonic waveguides enabling three-quantum dot superradiance