  We propose to use the quantum states of an electron trapped on the inner
surface of a graphene nanotorus to realize as a new kind of physical quantum
bit, which can be used to encode quantum information. Fundamental tasks for
quantum information processing, such as the qubit initialization and the
implementation of arbitrary single qubit gates, can be performed using external
magnetic and electric fields. We also analyze the robustness of the device
again systematic errors, which can be suppressed by a suitable choice of the
external control fields. These findings open new prospects for the development
an alternative platform for quantum computing, for which the scalability
remains to be determined.
