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Circuit quantum electrodynamics allows one to probe, manipulate and couplesuperconducting quantum bits using cavity photons at an exquisite level. One ofits cornerstones is the possibility to achieve the strong coupling which allowsone to hybridize coherently light and matter. Its transposition to quantum dotcircuits could offer the opportunity to use new degrees of freedom such asindividual charge or spin. However, the strong coupling of quantum dot circuitsto cavity photons remains to be observed. Here, we demonstrate a hybridsuperconductor-quantum dot circuit which realizes the strong coupling of anindividual electronic excitation to microwave photons. We observe a vacuum Rabisplitting 2g~10 MHz which exceeds by a factor of 3 the linewidth of thehybridized light-matter states. Our findings open the path to ultra-longdistance entanglement of quantum dot based qubits. They could be adapted tomany other circuit designs, shedding new light on the roadmap for scalabilityof quantum dot setups.

Strong coupling between an electron in a quantum dot circuit and a photon in a cavity