  Majorana bound states have been proposed as building blocks for qubits on
which certain operations can be performed in a topologically protected way
using braiding. However, the set of these protected operations is not
sufficient to realize universal quantum computing. We show that the electric
field in a microwave cavity can induce Rabi oscillations between adjacent
Majorana bound states. These oscillations can be used to implement an
additional single-qubit gate. Supplemented with one braiding operation, this
gate allows to perform arbitrary single-qubit operations.
