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The quantum state is prepared at MIT-LL (left) and sent across the fiber to the memory at Harvard (right). (b) The signal train consists of several pulses, shaped from continuous-wave lasers using carving modulators. Lasers then provide a reference clock for synchronization and encode a qubit. (c) The receiver synchronizes operations, converts the quantum frequency, and interfaces the incident quantum state with the memory. Detection of a photon heralds a successful state transfer.