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: Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; Ist Nazl Fis Nucl, Sez Firenze, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy; Nanosci Trento, Inst Mat Elect & Magnetism, FBK Div, I-38123 Povo, Trento, Italy; Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, Povo, Trento, Italy; CNR INO, Lgo Enrico Fermi 6, I-50125 Florence, Italy; Delft Univ Technol, Else Kooi Lab, NL-2628 Delft, Netherlands; Univ Trento, Dipartimento Fis, I-38123 Povo, Trento, Italy; European Lab Nonlinear Spect LENS, Via Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; UCL, Dept Phys & Astron, London WC1E 6BT, England.

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.

Journal/Review: PHYSICAL REVIEW A

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

More Information: This work has been supported by MIUR (“PRIN 2010-2011” and “QUANTOM”) and by INFN (“HUMOR” project). A.B. acknowledges support from the MIUR under the “FIRB Futuro in ricerca 2013” funding program, project code No. RBFR13QUVI.
KeyWords: Cavity Optomechanics; Quantum measurments;
DOI: 10.1103/PhysRevA.97.033833

Citations: 16
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