Strong-coupling theory of quantum-dot Josephson junctions: Role of a residual quasiparticle

Pavešić, Luka; Aguado, Ramón; Žitko, Rok

doi:10.1103/physrevb.109.125131

Phys. Rev. B

2024

DOI: 10.1103/physrevb.109.125131

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Strong-coupling theory of quantum-dot Josephson junctions: Role of a residual quasiparticle

Luka Pavešić,

Ramón Aguado,

Rok Žitko

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Cited by 2 publications

References 46 publications

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Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin

Estrada Saldaña,

Vekris,

Pavešič

et al. 2024

Nat Commun

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Controlled 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.

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Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin

Estrada Saldaña,

Vekris,

Pavešič

et al. 2024

Nat Commun

Self Cite

View full text Add to dashboard Cite

show abstract

Double quantum dot Andreev molecules: Phase diagrams and critical evaluation of effective models

Zalom,

Wrześniewski,

Novotný

et al. 2024

Phys. Rev. B

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Strong-coupling theory of quantum-dot Josephson junctions: Role of a residual quasiparticle

Cited by 2 publications

References 46 publications

Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin

Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin

Double quantum dot Andreev molecules: Phase diagrams and critical evaluation of effective models

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