2025/03/07 by Giavaras, G., Souto, Ruben Seoane, Calderon, Maria Jose +1
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · doi:10.48550/arxiv.2503.05284
Leveraging the higher harmonics content of the Josephson potential in a superconducting circuit offers a promising route in the search for new qubits with increased protection against decoherence. In this work, we demonstrate how the flux tunability of a hybrid semiconductor-superconductor Josephson junction based on a single full-shell nanowire enables this possibility. Near one flux quantum, Φ≈ Φ0=h/2e, we find that the qubit system can be tuned from a gatemon regime to a parity-protected regime with qubit eigenstates localized in phase space in the 0 and π minima of the Josephson potential (cos 2φ0). Estimates of qubit coherence and relaxation times due to different noise sources are presented.