Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction
M. Hays (Yale University)
G. de Lange (TU Delft - QRD/Kouwenhoven Lab, Yale University)
K. Serniak (Yale University)
D.J. van Woerkom (TU Delft - QRD/Kouwenhoven Lab)
D. Bouman (TU Delft - QRD/Kouwenhoven Lab)
P. Krogstrup (University of Copenhagen)
J. Nygård (University of Copenhagen)
A. Geresdi (TU Delft - QRD/Geresdi Lab)
M. H. Devoret (Yale University)
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Abstract
The modern understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semiconducting nanowires have led to the realization of superconducting qubits with gate-tunable Josephson energies. We have used a microwave circuit QED architecture to detect Andreev bound states in such a gate-tunable junction based on an aluminum-proximitized indium arsenide nanowire. We demonstrate coherent manipulation of these bound states, and track the bound-state fermion parity in real time. Individual parity-switching events due to nonequilibrium quasiparticles are observed with a characteristic timescale Tparity=160±10 μs. The Tparity of a topological nanowire junction sets a lower bound on the bandwidth required for control of Majorana bound states.