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Quantum entanglement is among the most fascinating aspects of quantum theory 1. Entangled optical photons are now widely used for fundamental tests of quantum mechanics 2 and applications such as quantum cryptography 1. Several recent experiments demonstrated entanglement of optical photons with trapped ions 3, atoms 4, 5 and atomic ensembles 6, 7, 8, which are then used to connect remote long-term memory nodes in distributed quantum networks 9, 10, 11. Here we realize quantum entanglement between the polarization of a single optical photon and a solid-state qubit associated with the single electronic spin of a nitrogen vacancy centre in diamond. Our experimental entanglement verification uses the quantum eraser technique 5, 12, and demonstrates that a high degree of control over interactions between a solid-state qubit and the quantum light field can be achieved. The reported entanglement …