title: Dual-path state reconstruction scheme for propagating quantum microwaves and detector noise tomography.
abstract: Quantum state reconstruction of weak propagating microwaves to date requires the use of linear amplifiers. We introduce a theory which, even in the presence of significant amplifier noise, allows one to use these devices for measuring all quadrature moments of propagating quantum microwaves based on cross correlations from a dual-path amplification setup. Simultaneously, the detector noise properties are determined, allowing for tomography. We demonstrate the feasibility of our novel concept by proof-of-principle experiments with classical mixtures of weak coherent microwaves.
authors.affiliation: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany. Edwin.Menzel@wmi.badw-muenchen.de
authors.forename: E P
authors.initials: EP
authors.lastname: Menzel
authors.forename: F
authors.initials: F
authors.lastname: Deppe
authors.forename: M
authors.initials: M
authors.lastname: Mariantoni
authors.forename: M A
authors.initials: MA
authors.lastname: Araque Caballero
authors.forename: A
authors.initials: A
authors.lastname: Baust
authors.forename: T
authors.initials: T
authors.lastname: Niemczyk
authors.forename: E
authors.initials: E
authors.lastname: Hoffmann
authors.forename: A
authors.initials: A
authors.lastname: Marx
authors.forename: E
authors.initials: E
authors.lastname: Solano
authors.forename: R
authors.initials: R
authors.lastname: Gross