title: Intracavity Squeezing Can Enhance Quantum-Limited Optomechanical Position Detection through Deamplification.
abstract: It has been predicted and experimentally demonstrated that by injecting squeezed light into an optomechanical device, it is possible to enhance the precision of a position measurement. Here, we present a fundamentally different approach where the squeezing is created directly inside the cavity by a nonlinear medium. Counterintuitively, the enhancement of the signal-to-noise ratio works by deamplifying precisely the quadrature that is sensitive to the mechanical motion without losing quantum information. This enhancement works for systems with a weak optomechanical coupling and/or strong mechanical damping. This can allow for larger mechanical bandwidth of quantum-limited detectors based on optomechanical devices. Our approach can be straightforwardly extended to quantum nondemolition qubit detection.
authors.affiliation: Institute for Theoretical Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Peano
authors.affiliation: Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany.|Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1 Bau 24, 91058 Erlangen, Germany.|Department of Physics, University of Otago, 730 Cumberland Street, Dunedin 9016, New Zealand.
authors.forename: H G L
authors.initials: HG
authors.lastname: Schwefel
authors.affiliation: Institute of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany.|Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1 Bau 24, 91058 Erlangen, Germany.|Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark.
authors.forename: Ch
authors.initials: Ch
authors.lastname: Marquardt
authors.affiliation: Institute for Theoretical Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 7, 91058 Erlangen, Germany.|Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1 Bau 24, 91058 Erlangen, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Marquardt