Scientific Results

Quantum nondemolition measurement of optical field fluctuations by optomechanical interaction

Year: 2018

Authors: Pontin A., Bonaldi M., Borrielli A., Marconi L., Marino F., Pandraud G., Prodi G.A., Sarro P.M., Serra E., Marin F.

Autors Affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy; Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Firenze, Via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy; Institute of Materials for Electronics and Magnetism, Nanoscience-Trento-FBK Division, 38123 Povo, Trento, Italy; INFN, Trento Institute for Fundamental Physics and Application, I-38123 Povo, Trento, Italy; CNR-INO, L.go Enrico Fermi 6, I-50125 Firenze, Italy; Delft University of Technology, Else Kooi Laboratory, 2628 Delft, The Netherlands; Dipartimento di Fisica, Università di Trento, I-38123 Povo, Trento, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), Via Carrara 1, I-50019 Sesto Fiorentino (FI), Italy

Abstract: According to quantum mechanics, if we keep observing a continuous variable we generally disturb its evolution. For a class of observables, however, it is possible to implement a so-called quantum nondemolition measurement: by confining the perturbation to the conjugate variable, the observable is estimated with arbitrary accuracy, or prepared in a well-known state. For instance, when the light bounces on a movable mirror, its intensity is not perturbed (the effect is just seen on the phase of the radiation), but the radiation pressure allows one to trace back its fluctuations by observing the mirror motion. In this work, we implement a cavity optomechanical experiment based on an oscillating micromirror, and we measure correlations between the output light intensity fluctuations and the mirror motion. We demonstrate that the uncertainty of the former is reduced below the shot-noise level determined by the corpuscular nature of light.determined by the corpuscular nature of light.


Volume: 97 (3)      Pages from: 033833-1  to: 033833-14

KeyWords: Cavity Optomechanics; Quantum measurments;
DOI: 10.1103/PhysRevA.97.033833

Citations: 10
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