Cooper pair splitting by means of graphene quantum dots

Physical Review Letters
Z B TanP J Hakonen

Abstract

A split Cooper pair is a natural source for entangled electrons which is a basic ingredient for quantum information in the solid state. We report an experiment on a superconductor-graphene double quantum dot (QD) system, in which we observe Cooper pair splitting (CPS) up to a CPS efficiency of ∼10%. With bias on both QDs, we are able to detect a positive conductance correlation across the two distinctly decoupled QDs. Furthermore, with bias only on one QD, CPS and elastic cotunneling can be distinguished by tuning the energy levels of the QDs to be asymmetric or symmetric with respect to the Fermi level in the superconductor.

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Citations

Mar 15, 2016·Scientific Reports·I V BorzenetsS Tarucha
Mar 24, 2017·Scientific Reports·Stefania SciaraGiuseppe Compagno
Feb 17, 2018·Reports on Progress in Physics·Gil-Ho Lee, Hu-Jong Lee
Apr 6, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kacper WrześniewskiIreneusz Weymann
Feb 10, 2016·Scientific Reports·Rosario Lo Franco, Giuseppe Compagno
Mar 16, 2018·Physical Review Letters·Nicklas WalldorfChristian Flindt
Jul 28, 2019·Physical Review Letters·Song-Bo Zhang, Björn Trauzettel
Feb 26, 2019·Beilstein Journal of Nanotechnology·Zoltán ScherüblSzabolcs Csonka
May 24, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ritu NehraAbhiram Soori
Dec 10, 2015·Physical Review Letters·G FülöpS Csonka
Dec 3, 2016·The Review of Scientific Instruments·Teemu NieminenPertti J Hakonen
Jan 10, 2021·Nature Communications·Z B TanP J Hakonen
Apr 24, 2021·Physical Review Letters·P PandeyD Beckmann
Jul 17, 2021·Physical Review Letters·Martin F JakobsenAlireza Qaiumzadeh
Nov 19, 2019·Nano Letters·Geon-Hyoung ParkHu-Jong Lee
Nov 6, 2021·Nature Communications·Antti RanniVille F Maisi

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