Concept

Oscillateur harmonique quantique

Publications associées (172)

Cavity Optomechanics with Whispering-Gallery Mode Optical Micro-Resonators

Parametric coupling of optical and mechanical degrees of freedom forms the basis of many ultra-sensitive measurements of both force and mechanical displacement. An optical cavity with a mechanically compliant boundary enhances the optomechanical interactio ...

2010

Determination of the vacuum optomechanical coupling rate using frequency noise calibration

Tobias Kippenberg, Albert Schliesser

The strength of optomechanical interactions in a cavity optomechanical system can be quantified by a vacuum coupling rate g(0) analogous to cavity quantum electrodynamics. This single figure of merit removes the ambiguity in the frequently quoted coupling ...

2010

Theoretical Analysis of Mechanical Displacement Measurement Using a Multiple Cavity Mode Transducer

Tobias Kippenberg, Jens Dobrindt

We present an optomechanical displacement transducer that relies on three cavity modes parametrically coupled to a mechanical oscillator and whose frequency spacing matches the mechanical resonance frequency. The additional resonances allow reaching the st ...

2010

A PSDT shell finite element formulation including structural damping

Alain Schorderet, Marco Matter, Joël Cugnoni

This paper describes efficient C-0-compatible finite elements for modelling structurally damped laminated composite plates and shells under harmonic vibrations. Based upon a shear deformation theory of any order p (PSDT), the elements are well adapted for ...

2010

Understanding Regioselective Cleavage in Peptide Hydrolysis by a Palladium(II) Aqua Complex: A Theoretical Point of View

Pablo Campomanes Ramos

Hydrolytic: cleavage of the oligopeptides Ace-Ala-Lys-Tyr-Gly similar to Gly-Met-Ala-Ala-Arg-Ala and Ace-Lys-Gly-Gly-Ala-Gly similar to Pro-Met-Ala-Ala-Arg-Gly by Pd(H2O)(4) was theoretically investigated by using molecular dynamics simulations and q ...

2010

Local Observation of Antibunching in a Trapped Fermi Gas

Jean-Philippe Brantut

Local density fluctuations and density profiles of a Fermi gas are measured in situ and analyzed. In the quantum degenerate regime, the weakly interacting 6Li gas shows a suppression of the density fluctuations compared to the nondegenerate case, where ato ...

American Physical Society2010

Probing the exciton condensate phase in 1T-TiSe2 with photoemission

Helmuth Berger, Philipp Aebi

We present recent results obtained using angle-resolved photoemission spectroscopy performed on 1T-TiSe2. Emphasis is put on the peculiarity of the bandstructure of TiSe2 compared to other transition metal dichalcogenides, which suggests that this system i ...

2010

Directly Observing Squeezed Phonon States with Femtosecond X-Ray Diffraction

Paul Beaud

Squeezed states are quantum states of a harmonic oscillator in which the variance of two conjugate variables each oscillate out of phase. Ultrafast optical excitation of crystals can create squeezed phonon states, where the variance of the atomic displacem ...

American Physical Society2009

Resolved-sideband cooling and position measurement of a micromechanical oscillator close to the Heisenberg uncertainty limit

Tobias Kippenberg, Albert Schliesser

The theory of quantum measurement of mechanical motion, describing the mutual coupling of a meter and a measured object, predicts a variety of phenomena such as quantum backaction, quantum correlations and non-classical states of motion. In spite of great ...

2009

Adaptive Frequency Oscillators and Applications

Auke Ijspeert, Jonas Buchli, Ludovic Righetti

In this contribution we present a generic mechanism to transform an oscillator into an adaptive frequency oscillator, which can then dynamically adapt its parameters to learn the frequency of any periodic driving signal. Adaptation is done in a dynamic way ...

2009

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