title: Partitioning of on-demand electron pairs.
abstract: The on-demand generation and separation of entangled photon pairs are key components of quantum information processing in quantum optics. In an electronic analogue, the decomposition of electron pairs represents an essential building block for using the quantum state of ballistic electrons in electron quantum optics. The scattering of electrons has been used to probe the particle statistics of stochastic sources in Hanbury Brown and Twiss experiments and the recent advent of on-demand sources further offers the possibility to achieve indistinguishability between multiple sources in Hong-Ou-Mandel experiments. Cooper pairs impinging stochastically at a mesoscopic beamsplitter have been successfully partitioned, as verified by measuring the coincidence of arrival. Here, we demonstrate the splitting of electron pairs generated on demand. Coincidence correlation measurements allow the reconstruction of the full counting statistics, revealing regimes of statistically independent, distinguishable or correlated partitioning, and have been envisioned as a source of information on the quantum state of the electron pair. The high pair-splitting fidelity opens a path to future on-demand generation of spin-entangled electron pairs from a suitably prepared two-electron quantum-dot ground state.
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany.
authors.forename: Niels
authors.initials: N
authors.lastname: Ubbelohde
authors.affiliation: Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Hohls
authors.affiliation: Faculty of Physics and Mathematics, University of Latvia, LV-1002, Riga, Latvia.
authors.forename: Vyacheslavs
authors.identifier: 0000000248698837
authors.initials: V
authors.lastname: Kashcheyevs
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany.
authors.forename: Timo
authors.initials: T
authors.lastname: Wagner
authors.affiliation: Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: Lukas
authors.initials: L
authors.lastname: Fricke
authors.affiliation: Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Kästner
authors.affiliation: Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: Klaus
authors.initials: K
authors.lastname: Pierz
authors.affiliation: Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
authors.forename: Hans W
authors.initials: HW
authors.lastname: Schumacher
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany.
authors.forename: Rolf J
authors.initials: RJ
authors.lastname: Haug