Kapitza-Dirac-Talbot-Lau (KDTL) interferometry

KDTL-interferometry is a promising method to study the quantum wave nature of highly polarizable large molecules. It avoids the van der Waals dephasing at the second grating of a nanomechanical Talbot-Lau interferometer and replaces the central mask by a standing light wave diffraction grating. More information

Matter-wave interferometer with photo-depletion gratings in the time domain (OTIMA)

A new interferometer concept is proposed for large molecular and metal clusters: A VUV standing laser light  wave shall form a highly precise and ultra-narrow  absorptive grating for clusters that are susceptible to single-photon ionization. This concept can be realized in space and in the time-domain - thus providing high precision for future cluster metrology experiments. More information

Far-field diffration at nanofabricated, nanobiologically grown and optical gratings

Far-field grating diffraction is a particularly appealing way to demonstrate the quantum wave nature of large objects. A number of experiments were able to do so with nanomechanical and optical gratings. More information

Cavity cooling of nanoparticles

A key challenge for future quantum delocalization and interference experiments with massive objects is to provide a coherent, i.e. cold and localized particle source.

We are therefore exploring the off-resonant laser cooling of dielectric nanoparticles.

We have seen the first cooling of 10^10 amu silicon particles by a factor of  up to 30 in the transverse kinetic energy. More on cavity experiments

Molecular Beam Methods for Quantum Experiments with Biomolecules

We are developing new methods to prepare beams of biomolecular nanomatter and new techniques to detect them with high sensitivity. This work paves the path to quantum experiments with biomolecules and biomolecular clusters.

Simulated Interactive Research Experiments

In an interdisciplinary research we are developing Simulated Interactive Research Experiments (SIRE) as a new web-tool to communicate modern science to students and the public. SIRE are highly complex interactive simulations of real existing research experiments with authentic photorealistic visualizations and realistic interaction. They open a wide space for curiosity driven learning and allow interacting with phenomena that are usually only observed by scientists. Follow the links here:

Talbot-Lau interferometry (TLI)

Near-field interferometry is a particularly useful concept for demonstrating the quantum wave nature of molecules, as it allows to operate with molecular beams of limited spatial and temporal coherence. We have demonstrated the first full interferometer for complex molecules, here realized in a Talbot-Lau arrangement. More information

Experimental decoherence: Thermal emission of light

Thermal Decoherence

We present the first quantitative study on how the thermal emission of a hot molecule

may reduce its de Broglie coherence. Fullernes are laser heated to temperatures well in excees of 1000 K and seen to loose their de Broglie quantum interference contrast as a function of internal temperature.

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Collisional decoherence

Collisional decoherence

Collisions even with highly diluted gases can lead to decoherence of molecular matter waves.  Our experiments with delocalized fullerenes allow us to estimate the limits on

macromolecular interference that are imposed by collisional perturbations.

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Molecule lithography

Molecular near-field interferometry intrinsically creates flying molecular nanostrucutres which can be deposited and imaged on atomically clean surfaces. Quantum assisted molecule lithography is a new field of research which studies the potential of quantum interference for enscribing large area nanopatterns composed of single molecules. More information