Controlled parity of cooper pair tunneling in a hybrid superconducting qubit.

ABSTRACT: Superconducting quantum circuits derive their nonlinearity from the Josephson energy-phase relation. Besides the fundamental cosϕ term, this relation can also contain higher Fourier harmonics cos(kϕ) corresponding to correlated tunneling of k Cooper pairs. The parity of the dominant tunneling process, i.e. whether an odd or even number of Cooper pairs tunnel, results in qualitatively different properties, and controlling this opens up a wide range of applications in superconducting technology. However, access to even-dominated regimes has remained challenging and has so far relied on complex multi-junction or all-hybrid architectures. Here, we demonstrate a simple "harmonic parity qubit"; an element that combines two aluminum-oxide tunnel junctions in parallel to a gate-tunable InAs/Al nan

SUBMITTER: Feldstein-Bofill D 

PROVIDER: S-EPMC13526837 | biostudies-literature | 2026 Jul

REPOSITORIES: biostudies-literature