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We demonstrate a new versatile building block for optical quantumtechnologies, based on an intracavity Rydberg-blockaded atomic ensemble actingas a single two-level superatom. We coherently control its state and opticallydetect it in a single shot with a $95\%$ efficiency. Crucially, we demonstratea superatom-state-dependent $\pi$ phase rotation on the light reflected fromthe cavity. Together with the state manipulation and detection, it is a keyingredient for implementing deterministic photonic entangling gates and forgenerating highly non-classical light states.

An Intracavity Rydberg Superatom for Optical Quantum Engineering: Coherent Control, Single-Shot Detection and Optical $\pi$ Phase Shift