title: Phase shift of a weak coherent beam induced by a single atom.
abstract: We report on a direct measurement of a phase shift on a weak coherent beam by a single 87Rb atom in a Mach-Zehnder interferometer. By strongly focusing the probe mode to the location of the atom, a maximum phase shift of about 1 degree is observed experimentally.
authors.affiliation: Center for Quantum Technologies and Department of Physics, National University of Singapore, 3 Science Drive 2, Singapore, 117543.
authors.forename: Syed Abdullah
authors.initials: SA
authors.lastname: Aljunid
authors.forename: Meng Khoon
authors.initials: MK
authors.lastname: Tey
authors.forename: Brenda
authors.initials: B
authors.lastname: Chng
authors.forename: Timothy
authors.initials: T
authors.lastname: Liew
authors.forename: Gleb
authors.initials: G
authors.lastname: Maslennikov
authors.forename: Valerio
authors.initials: V
authors.lastname: Scarani
authors.forename: Christian
authors.initials: C
authors.lastname: Kurtsiefer