a semiconductor body consisting principally of silicon;

one or more local luminescent defects disposed within the semiconductor body, wherein the one or more luminescent defects are one or more radiation damage centres, wherein:

a respective local luminescent defect included in the one or more local luminescent defects is associated with a respective first bound exciton-state corresponding to a first configuration for one or more bound excitons localized at the respective local luminescent defect,

the respective local luminescent defect has a first computational state and a second computational state, and

the first computational state corresponds to the respective first bound exciton state and the second computational state differs from the first computational state at least by a degree of freedom of the respective first bound exciton state; and

a control system, including circuitry, communicatively coupled to the semiconductor body, the control system configured by processor-executable instructions to manipulate the one or more local luminescent defects to store quantum information in a quantum state of the one or more local luminescent defects that comprises the first computational state, the second computational state or a superposition of the first and second computational states.