Collective subradiant states, characterized by strongly suppressed radiative decay, provide a promising platform for quantum information storage. A particularly attractive application is the storage of arbitrary qubit states, enabled by the long lifetimes of these collective excitations. Yet their intrinsically weak coupling to propagating modes poses a major obstacle to high-efficiency, high-fidelity photon storage and retrieval. Here we present a waveguide-QED protocol that overcomes this limitation in a chain of emitters by dynamically modulating their resonance frequencies. This temporal control tailors the collective decay rates, allowing single-photon pulses to efficiently excite subradiant states and to be deterministically converted into long-lived dark states. By programming spatial detuning patterns, we show that arbitrary time-bin qubit states can be mapped on demand onto two orthogonal dark states. These results establish a scalable route to subradiant-state-based quantum memories and open opportunities for integrated quantum photonic devices.

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• Quantum memories