The present disclosure generally relates to compositions and devices for, e.g., hosting qubits, and processes of use. In an embodiment, a quantum device is provided. The quantum device includes a composition, the composition comprising a first component comprising a nanotube and a second component comprising a compound, the compound comprising a metal-bound cyclic tetrapyrrole, an ion thereof, or a combination thereof. In another embodiment, a process for controlling a quantum spin is provided. The process includes cooling a composition described herein to a temperature of about 1 K or more, applying a voltage to the composition, introducing a magnetic field to the composition, and introducing microwave radiation to the composition.