title: Density matrix tomography through sequential coherent optical rotations of an exciton qubit in a single quantum dot.
abstract: We demonstrate single qubit density matrix tomography in a single semiconductor quantum dot system through consecutive phase sensitive rotations of the qubit via ultrafast coherent optical excitations. The result is important for quantifying gate operations in quantum information processing in the quantum dot systems as well as demonstrating consecutive arbitrary qubit rotations.
authors.affiliation: The H.M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Yanwen
authors.initials: Y
authors.lastname: Wu
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Li
authors.forename: L M
authors.initials: LM
authors.lastname: Duan
authors.forename: D G
authors.initials: DG
authors.lastname: Steel
authors.forename: D
authors.initials: D
authors.lastname: Gammon