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A non-classical light source emitting pairs of identical photons represents aversatile resource of interdisciplinary importance with applications in quantumoptics and quantum biology. Emerging research fields, which benefit from suchtype of quantum light source, include quantum-optical spectroscopy orexperiments on photoreceptor cells sensitive to photon statistics. To date,photon twins have mostly been generated using parametric downconversionsources, relying on Poissonian number distributions, or atoms, exhibiting lowemission rates. Here, we propose and experimentally demonstrate the efficient,triggered generation of photon twins using the energy-degeneratebiexciton-exciton radiative cascade of a single semiconductor quantum dot.Deterministically integrated within a microlens, this nanostructure emitshighly-correlated photon pairs, degenerate in energy and polarization, at arate of up to (234 $\pm$ 4) kHz. Furthermore, we verify a significant degree ofphoton-indistinguishability and directly observe twin-photon emission byemploying photon-number-resolving detectors, which enables the reconstructionof the emitted photon number distribution.

A bright triggered twin-photon source in the solid state