Warsaw

Attila Geresdi (26.02, 11:30)

Affiliation: QuTech Delft, the Netherlands

Title: Experimental signatures of Majorana bound states: how close are we to braiding?

Abstract:
In this talk, I will discuss recent experimental progress with the detection of Majorana zero modes (MZMs) in semiconductor nanowire-superconductor platform. Initial experiments focused on voltage bias spectroscopy of the MZM, where the experimental signature is a zero bias conductance peak. I will show how the improved materials enabled more subtle checks on the spectroscopical signatures of MZMs. Another class of experiments addresses the topological Josephson junction, where the supercurrent flows through a weak link between two topological superconductors hosting MZMs. Here, the measurements concern the phase periodicity of the Josephson effect, which is expected to pick up a factor of two in the topological regime. I will discuss our efforts to detect MZMs by measuring the Josephson radiation frequency of nanowire Josephson junctions and comment on the experimental results from the perspective of braiding, the coherent manipulation of prospective quantum bits.