• Publications
  • Influence
Macroscopicity of mechanical quantum superposition states.
We propose an experimentally accessible, objective measure for the macroscopicity of superposition states in mechanical quantum systems. Based on the observable consequences of a minimal,
Decoherence of matter waves by thermal emission of radiation
Good quantitative agreement is found between the experimental observations and microscopic decoherence theory of matter wave interferometer experiments in which C70 molecules lose their quantum behaviour by thermal emission of radiation.
Colloquium: Quantum interference of clusters and molecules
We review recent progress and future prospects of matter wave interferometry with complex organic molecules and inorganic clusters. Three variants of a near-field interference effect, based on
Introduction to decoherence theory
This is an introduction to the theory of decoherence with an emphasis on its microscopic origins and on a dynamic description. The text corresponds to a chapter soon to be published in: A.
Theory of decoherence in a matter wave Talbot-Lau interferometer (18 pages)
We present a theoretical framework to describe the effects of decoherence on matter waves in Talbot-Lau interferometry. Using a Wigner description of the stationary beam the loss of interference
Near-field interferometry of a free-falling nanoparticle from a point-like source.
An interferometer with a levitated, optically cooled and then free-falling silicon nanoparticle in the mass range of one million atomic mass units, delocalized over >150 nm is proposed and indicates that this is a viable route towards macroscopic high-mass superpositions using available technology.
Optomechanical sensing of spontaneous wave-function collapse.
It is shown that the opposite is the case for optomechanical systems in the presence of generic noise sources, such as thermal and measurement noise, that the sensitivity to these unconventional effects grows with the mass of the mechanical quantum system.
Quantum interference of large organic molecules
It is shown that even complex systems, with more than 1,000 internal degrees of freedom, can be prepared in quantum states that are sufficiently well isolated from their environment to avoid decoherence and to show almost perfect coherence.
A Kapitza–Dirac–Talbot–Lau interferometer for highly polarizable molecules
Research on matter waves is a thriving field of quantum physics and has recently stimulated many investigations with electrons1, neutrons2, atoms3, Bose-condensed ensembles4, cold clusters5 and hot