Flip-Chip-Based Microwave Spectroscopy of Andreev Bound States in a Planar Josephson Junction

Andreev-level spectroscopy and Josephson-current switching in a three-terminal Josephson junction

We calculate the electrical currents through a superconductor-insulator-superconductor junction which is also weakly coupled to a normal-metal side probe. The voltage V applied to the normal-metal terminal controls the occupation of Andreev energy levels En , and therefore controls the Josephson current flowing through these levels. Whenever the probe voltage crosses an Andreev level, the Josep...

Tunneling spectroscopy of quasiparticle bound states in a spinful Josephson junction.

The spectrum of a segment of InAs nanowire, confined between two superconducting leads, was measured as function of gate voltage and superconducting phase difference using a third normal-metal tunnel probe. Subgap resonances for odd electron occupancy-interpreted as bound states involving a confined electron and a quasiparticle from the superconducting leads, reminiscent of Yu-Shiba-Rusinov sta...

Mesoscopic superconductors under irradiation: Microwave spectroscopy of Andreev states

We show that irradiation of a voltage-biased superconducting quantum point contact at frequencies of the order of the gap energy can remove the suppression of subgap dc transport through Andreev levels. Quantum interference among resonant scattering events involving photon absorption is furthermore shown to make microwave spectroscopy of the Andreev levels feasible. We also discuss how the same...

Topological Superconductivity in a Planar Josephson Junction

We consider a two-dimensional electron gas with strong spin-orbit coupling contacted by two superconducting leads, forming a Josephson junction. We show that in the presence of an in-plane Zeeman field, the quasi-one-dimensional region between the two superconductors can support a topological superconducting phase hosting Majorana bound states at its ends. We study the phase diagram of the syst...

Josephson tunnel junction microwave attenuator