3 years ago

# Direct microwave measurement of Andreev-bound-state dynamics in a proximitized semiconducting nanowire.

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

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 InAs 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 non-equilibrium quasiparticles are observed with a characteristic timescale $T_\mathrm{parity} = 160\pm 10~\mathrm{\mu s}$. The $T_\mathrm{parity}$ of a topological nanowire junction sets a lower bound on the bandwidth required for control of Majorana bound states.

Publisher URL: http://arxiv.org/abs/1711.01645

DOI: arXiv:1711.01645v1

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