Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction

Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction

Hays, M. (Yale University)
de Lange, G. (TU Delft QRD/Kouwenhoven Lab; Yale University)
Serniak, K. (Yale University)
van Woerkom, D.J. (TU Delft QRD/Kouwenhoven Lab)
Bouman, D. (TU Delft QRD/Kouwenhoven Lab)
Krogstrup, P. (University of Copenhagen)
Nygård, J. (University of Copenhagen)
Geresdi, A. (TU Delft QRD/Geresdi Lab)
Devoret, M. H. (Yale University)

2018

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.

http://resolver.tudelft.nl/uuid:01242055-c8bb-47a2-a5d4-dbe0877b3537

https://doi.org/10.1103/PhysRevLett.121.047001

0031-9007

Physical Review Letters, 121 (4)

Institutional Repository

journal article

© 2018 M. Hays, G. de Lange, K. Serniak, D.J. van Woerkom, D. Bouman, P. Krogstrup, J. Nygård, A. Geresdi, M. H. Devoret