Interactions between solid-state quantum emitters and cavities are importantfor a broad range of applications in quantum communication, linear opticalquantum computing, nonlinear photonics, and photonic quantum simulation. Theseapplications often require combining many devices on a single chip withidentical emission wavelengths in order to generate two-photon interference,the primary mechanism for achieving effective photon-photon interactions. Suchintegration remains extremely challenging due to inhomogeneous broadening andfabrication errors that randomize the resonant frequencies of both the emittersand cavities. In this letter we demonstrate two-photon interference fromindependent cavity-coupled emitters on the same chip, providing a potentialsolution to this long-standing problem. We overcome spectral mismatch betweendifferent cavities due to fabrication errors by depositing and locallyevaporating a thin layer of condensed nitrogen. We integrate optical heaters totune individual dots within each cavity to the same resonance with better than3 {\mu}eV of precision. Combining these tuning methods, we demonstratetwo-photon interference between two devices spaced by less than 15 {\mu}m onthe same chip with a post-selected visibility of 33%. These results pave theway to integrate multiple quantum light sources on the same chip to developquantum photonic devices.
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