Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.047001
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Funding
- NSF MRSEC DMR [1119826]
- ARO [W911NF-14-1-0011]
- MURI-ONR [N00014-16-1-2270]
- Microsoft Corporation Station Q
- Synergy Grant of the European Research Council
- Danish National Research Foundation (DG-QDev)
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [656129]
- Netherlands Organisation for Scientific Research (NWO) through a VENI grant
- Marie Curie Actions (MSCA) [656129] Funding Source: Marie Curie Actions (MSCA)
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The modem 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 T-parity = 160 +/- 10 mu s. The T-parity of a topological nanowire junction sets a lower bound on the bandwidth required for control of Majorana bound states.
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