Quantum and dynamical back-action effects using a gram-scale mechanical resonator in a high-finesse optical cavity
type: Dataset
description: Cavity Optomechanics, that is the study of the interaction between an optical cavity mode and a mechanical degree of freedom, has known impressive evolution over the past decade, to become a new field at the union of condensed matter physics and optics. One of the major goals of this discipline is to test and study quantum mechanics using macroscopic systems. Among the most fundamental problems the community aims to address is the question of the quantum limits in position measurement. Quantum mechanics predicts that any measurement comes along with a backaction, which perturbs the state of the measured system. Moreover, it is expected to be conjugated with the quantum noise of the measurement apparatus (called measurement noise) used to probe the system. The optimal sensitivity is reached whenever both the measurement and the backaction noise are identical, a situation which can be assimilated to the acceptance of Heisenberg's inequality for the measurement apparatus. In cavity optomechanics, the mode of an optical cavity is used as a measurement apparatus of the position of a mechanical resonator which is expected to be responsible for the backaction imprecision. However, this so-called radiation pressure quantum backaction has never been observed to date, while it remains a decisive step towards understanding quantum measurement processes. We describe in this manuscript the study of radiation pressure effects in cavity optomechanics. We introduce the optomechanical system we have developed, which consists in a cm-scale ultra high Q (~ 1 000 000) plano-convex mechanical resonator incorporated into a ultra-high finesse (~ 300 000) Fabry-Prot cavity. We present two important results we obtained with this system. First, we were able to report the first direct observation of radiation pressure in real-time, based on establishing pump-probe correlations. We were also able to demonstrate for the first time nonlinear backaction effects related to substantial improvement …
issued: 2026-05-11T12:07:02.526480
language: en
modified: 2026-05-11T12:07:02.526484
contact point: Organization
  fn: CCSD
keyword: amplification-par-action-en-retour
keyword: correlations-optomechaniques
keyword: couplage-optomecanique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: limite-quantique-standard
keyword: physphysphys-atom-phphysics-physicsphysics-physicsatomic-physics-physicsatom-ph
keyword: physphysphys-opticsphysics-physicsphysics-physicsoptics-physicsoptics
keyword: physqphyphysics-physicsquantum-physics-quant-ph
keyword: pression-de-radiation
keyword: theses
landing page: https://theses.hal.science/tel-00813308

Quantum and dynamical back-action effects using a gram-scale mechanical resonator in a high-finesse optical cavity
type: Distribution
format: HTML
issued: 2026-05-11T12:07:02.529540
modified: 2026-05-11T12:07:02.508485
access URL: https://theses.hal.science/tel-00813308

test_moissonnage_selune
type: Agent