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We report the measurement of field-field and photon-photon correlations of light scattered by two InAs quantum dots separated by ≈40  μm. Near 4 K a large fraction of photons can be scattered coherently by each quantum dot leading to one-photon interference at a beam splitter (visibility ≈20%). Simultaneously, two-photon interference is also observed (visibility ≈40%) due to the indistinguishability of photons scattered by the two different quantum emitters. We show how spectral diffusion accounts for the reduction in interference visibility through variations in photon flux.

Field-Field and Photon-Photon Correlations of Light Scattered by Two Remote Two-Level InAs Quantum Dots on the Same Substrate