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We investigate the dynamics of a charge qubit consisting of twoCoulomb-blockaded islands hosting Majorana zero modes. The frequency of thequbit is determined by coherent single-electron tunneling between two islandsoriginating from the hybridization of two Majorana zero modes localized at thejunction. We calculate the sequential tunneling current $I$ through thedouble-island device coupled to normal metal leads. We demonstrate that the$I\!-\!V$ characteristics in the large-bias regime can be used as a measurementof the coherent Majorana coupling $E_M$. We propose dc and ac transportexperiments for measuring $E_M$, and discuss their limitations due to intrinsicdephasing mechanisms such as excited quasiparticles.

Majorana signatures in charge transport through a topological superconducting double-island system