We observe antibunching in the photons emitted from a strongly-coupled singlequantum dot and pillar microcavity in resonance. When the quantum dot wasspectrally detuned from the cavity mode, the cavity emission remainedantibunched, and also anticorrelated from the quantum dot emission. Resonantpumping of the selected quantum dot via an excited state enabled theseobservations by eliminating the background emitters that are usually coupled tothe cavity. This device demonstrates an on-demand single photon sourceoperating in the strong coupling regime, with a Purcell factor of 61 andquantum effciency of 97%
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