title: Coherent coupling of two dopants in a silicon nanowire probed by Landau-Zener-Stückelberg interferometry.
abstract: We report on microwave-driven coherent electron transfer between two coupled donors embedded in a silicon nanowire. By increasing the microwave frequency we observe a transition from incoherent to coherent driving revealed by the emergence of a Landau-Zener-Stückelberg quantum interference pattern of the measured current through the donors. This interference pattern is fitted to extract characteristic parameters of the double-donor system. In particular we estimate a charge dephasing time of 0.3±0.1  ns, comparable to other types of charge-based two-level systems. The demonstrated coherent coupling between two dopants is an important step towards donor-based quantum computing devices in silicon.
authors.affiliation: SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble 38054, France. eva.dupont-ferrier@grenoble.cnrs.fr
authors.forename: E
authors.initials: E
authors.lastname: Dupont-Ferrier
authors.forename: B
authors.initials: B
authors.lastname: Roche
authors.forename: B
authors.initials: B
authors.lastname: Voisin
authors.forename: X
authors.initials: X
authors.lastname: Jehl
authors.forename: R
authors.initials: R
authors.lastname: Wacquez
authors.forename: M
authors.initials: M
authors.lastname: Vinet
authors.forename: M
authors.initials: M
authors.lastname: Sanquer
authors.forename: S
authors.initials: S
authors.lastname: De Franceschi