title: Quantum amplifier: measurement with entangled spins.
abstract: It is experimentally demonstrated that entangled quantum states can be used to amplify perturbations and to increase changes in observable values. The physical system is seven nuclear spins of single-labeled (13)C-benzene in a liquid crystalline matrix. An entangled state of six proton spins was used to monitor interaction with the (13)C spin.
authors.affiliation: Department of Chemistry, Kent State University, Kent, Ohio 44242-0001, USA.
authors.forename: Jae-Seung
authors.initials: JS
authors.lastname: Lee
authors.forename: A K
authors.initials: AK
authors.lastname: Khitrin