(color online) Illustration of the Kitaev tube which can be viewed as the Kitaev ladder (see Fig. 1) rolled up in y dimension. Φ denotes the magnetic flux through the tube, which leads to a phase factor e i θ in the inter-chain hopping integral as shown in Eq. (25). The relation of θ and Φ is θ = 2 π Φ / ( M Φ 0 ) with Φ 0 being the magnetic flux quantum.