Abstract
AbstractControlled coupling between distant particles is a key requirement for the implementation of quantum information technologies. A promising platform are hybrid systems of semiconducting quantum dots coupled to superconducting islands, where the tunability of the dots is combined with the macroscopic coherence of the islands to produce states with non-local correlations, e.g. in Cooper pair splitters. Electrons in hybrid quantum dots are typically not amenable to long-distance spin alignment as they tend to be screened into a localized singlet state by bound superconducting quasiparticles. However, two quasiparticles coming from different superconductors can overscreen the quantum dot into a doublet state, leading to ferromagnetic correlations between the superconducting islands. We present experimental evidence of a stabilized overscreened state, implying correlated quasiparticles over a micrometer distance. We propose alternating chains of quantum dots and superconducting islands as a novel platform for controllable large-scale spin coupling.
Funder
EC | Horizon 2020 Framework Programme
Novo Nordisk Fonden
Carlsbergfondet
Danmarks Grundforskningsfond
Villum Fonden
Københavns Universitet
Javna Agencija za Raziskovalno Dejavnost RS
Sino-Danish Center
Publisher
Springer Science and Business Media LLC
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