Abstract: Methods and apparatus for storing and transducing quantum information provide a luminescent center in silicon controllably coupled to undergo quantum interactions with a first qubit such as a superconducting qubit. The luminescent center may be a T center or an ensemble of T centers, for example. The same or different quantum information may be stored in an unpaired electron or hole spin, and/or one or more of three nuclear spins of the T center. The stored quantum information may be later returned to the first qubit or transferred to an optical photon state.