Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems

de Jong, Damaz; Prosko, Christian G.; Han, Lin; Malinowski, Filip K.; Liu, Yu; Kouwenhoven, Leo P.; Pfaff, Wolfgang

doi:10.1103/physrevlett.131.157001

Cited by 6 publications

(1 citation statement)

References 69 publications

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“…Chains of quantum dots (QD) and superconducting islands (SI) can be fabricated by appropriately patterning and locally gating superconductor-semiconductor hybrid nanowires. These systems are excellent for exploring non-local properties of discrete states in superconducting gaps (subgap states) 1 , qubits 2 – 4 , and non-local processes 5 – 11 for topological 12 , 13 and non-topological chains 14 . The subgap states in QD-SI heterostructures are induced by the spin exchange (Kondo) interaction binding a Bogoliubov quasiparticle and the QD magnetic moment into a singlet state 15 – 23 .…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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Spectral and Transport Properties of Andreev Molecule Coupled to Majorana Wire

Górski,

Kucab

2024

Annalen der Physik

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The quasiparticle spectrum and transport properties of the double quantum dot (DQD) deposited on a superconducting substrate (Andreev molecule) and side‐coupled to a nanowire hosting Majorana zero modes (MZMs) are studied. Placing a DQD on the superconducting substrate induces the trivial Andreev‐bound states (ABSs) in quantum dots. However, coupling of DQD with a nanowire causes the leakage of the MZM from the topological nanowire into quantum dots. The relationship between the Andreev states and the Majorana mode for different values of the coupling parameters is analyzed. Additionally, it is shown that the connection point of a metallic tip, treated as an scanning tunneling microscope (STM) tip, affects the measured results of the differential conductance.

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