title: Giant cross-Kerr effect for propagating microwaves induced by an artificial atom.
abstract: We investigate the effective interaction between two microwave fields, mediated by a transmon-type superconducting artificial atom which is strongly coupled to a coplanar transmission line. The interaction between the fields and atom produces an effective cross-Kerr coupling. We demonstrate average cross-Kerr phase shifts of up to 20 degrees per photon with both coherent microwave fields at the single-photon level. Our results provide an important step toward quantum applications with propagating microwave photons.
authors: Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
authors: Io-Chun
authors: IC
authors: Hoi
authors: Anton F
authors: AF
authors: Kockum
authors: Tauno
authors: T
authors: Palomaki
authors: Thomas M
authors: TM
authors: Stace
authors: Bixuan
authors: B
authors: Fan
authors: Lars
authors: L
authors: Tornberg
authors: Sankar R
authors: SR
authors: Sathyamoorthy
authors: Göran
authors: G
authors: Johansson
authors: Per
authors: P
authors: Delsing
authors: C M
authors: CM
authors: Wilson