Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems

Abstract

Cooper pair splitters hold utility as a platform for investigating the entanglement of electrons in Cooper pairs, but probing splitters with voltage-biased Ohmic contacts prevents the retention of electrons from split pairs since they can escape to the drain reservoirs. We report the ability to controllably split and retain single Cooper pairs in a multi-quantum-dot device isolated from lead reservoirs, and separately demonstrate a technique for detecting the electrons emerging from a split pair. First, we identify a coherent Cooper pair splitting charge transition using dispersive gate sensing at GHz frequencies. Second, we utilize a double quantum dot as an electron parity sensor to detect parity changes resulting from electrons emerging from a superconducting island.

18 pages, 12 figures. D.J. and C.G.P. contributed equally to this work

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Cited by in corpus (7)

• Fate of poor man's Majoranas in the long Kitaev chain limit
• Adiabatic Cooper pair splitter
• Double-quantum-dot Andreev molecules: Phase diagrams and critical evaluation of effective models
• Thermoelectric processes of quantum normal-superconductor interfaces
• Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter
• Properties and prevalence of false poor man's Majoranas in two- and three-site artificial Kitaev chains
• Cooper-pair splitters as circuit elements for realizing topological superconductors