David van Zanten (26.02, 16:30)
Affiliation: University of Copenhagen, Denmark Title: Probing coherent coupling of Majorana modes via single-electron photon assisted tunneling Abstract:The coherent coupling between Majorana zero modes localized in distinct topological islands mixes the 1e charge states of islands. This coherent superposition of even and odd parity states is a necessary condition for the operation of topological qubits. We demonstrate the coherent coupling of zero modes in a superconducting double island created in a InAs/Al nanowire. This is achieved by tracking microwave induced charge transitions between the islands. The dispersion of photon assisted tunneling features is 1e periodic and shows the presence of an anti-crossing between even and odd parity charge states. In this talk I will first discuss the magnetic field induced transition from 2e to 1e periodic charge states of a superconducting double island device measured using a RF charge sensor. Next, I will discuss the observation of photon assisted tunneling features and show that the 1e periodicity results from discrete zero-energy states which emerge in magnetic field.