title: Can Anomalous Amplification be Attained without Postselection?
abstract: We present a parameter estimation technique based on performing joint measurements of a weak interaction away from the weak-value-amplification approximation. Two detectors are used to collect full statistics of the correlations between two weakly entangled degrees of freedom. Without discarding of data, the protocol resembles the anomalous amplification of an imaginary-weak-value-like response. The amplification is induced in the difference signal of both detectors allowing robustness to different sources of technical noise, and offering in addition the advantages of balanced signals for precision metrology. All of the Fisher information about the parameter of interest is collected. A tunable phase controls the strength of the amplification response. We experimentally demonstrate the proposed technique by measuring polarization rotations in a linearly polarized laser pulse. We show that in the presence of technical noise the effective sensitivity and precision of a split detector is increased when compared to a conventional continuous-wave balanced detection technique.
authors.affiliation: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.|Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
authors.forename: Julián
authors.initials: J
authors.lastname: Martínez-Rincón
authors.affiliation: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.|College of Science, National University of Defense Technology, Changsha 410073, People's Republic of China.|Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
authors.forename: Wei-Tao
authors.initials: WT
authors.lastname: Liu
authors.affiliation: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.|Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
authors.forename: Gerardo I
authors.initials: GI
authors.lastname: Viza
authors.affiliation: Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.|Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.|Institute of Optics, University of Rochester, Rochester, New York 14627, USA.|Institute for Quantum Studies, Chapman University, 1 University Drive, Orange, California 92866, USA.
authors.forename: John C
authors.initials: JC
authors.lastname: Howell