1. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA
2. Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA
3. These authors contributed equally to this work.

Correspondence to: Jelena Vukovi¹ Correspondence and requests for materials should be addressed to J.V. (Email: jela@stanford.edu).

Solid-state cavity quantum electrodynamics (QED) systems offer a robust and scalable platform for quantum optics experiments and the development of quantum information processing devices. In particular, systems based on photonic crystal nanocavities and semiconductor quantum dots have seen rapid progress. Recent experiments have allowed the observation of weak¹ and strong coupling^{2, 3} regimes of interaction between the photonic crystal cavity and a single quantum dot in photoluminescence. In the weak coupling regime¹, the quantum dot radiative lifetime is modified; in the strong coupling regime³, the coupled quantum dot also modifies the cavity spectrum. Several proposals for scalable quantum information networks and quantum computation rely on direct probing of the cavity–quantum dot coupling, by means of resonant light scattering from strongly or weakly coupled quantum dots^{4, 5, 6, 7, 8, 9}. Such experiments have recently been performed in atomic systems^{10, 11, 12} and superconducting circuit QED systems¹³, but not in solid-state quantum dot–cavity QED systems. Here we present experimental evidence that this interaction can be probed in solid-state systems, and show that, as expected from theory, the quantum dot strongly modifies the cavity transmission and reflection spectra. We show that when the quantum dot is coupled to the cavity, photons that are resonant with its transition are prohibited from entering the cavity. We observe this effect as the quantum dot is tuned through the cavity and the coupling strength between them changes. At high intensity of the probe beam, we observe rapid saturation of the transmission dip. These measurements provide both a method for probing the cavity–quantum dot system and a step towards the realization of quantum devices based on coherent light scattering and large optical nonlinearities from quantum dots in photonic crystal cavities.

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