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Deterministic quantum information processing will require hybrid quantum systems like an interface between microwave and optical photons. We propose a scheme for efficient, multimode and coherent microwave-optical conversion based on frequency mixing in Rydberg atoms.
We show the highest (>105) and longest-lived (>3 hours) optical depths of alkali vapours in hollow-core photonic crystal fibres, which we will use to implement a novel noiseless broadband quantum memory scheme for temporal multiplexing.