Ch. Koller
Vienna University of Technology
11 Papers
8 Citations
Ch. Koller is an academic researcher from Vienna University of Technology. The author has contributed to research in topics: Quantum tunnelling & Electron. The author has an hindex of 7, co-authored 11 publications.
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Papers
Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity
TL;DR: In this paper, an ensemble of ultracold atoms placed in the near field of a superconducting coplanar waveguide resonator with a quality factor of $Q\ensuremath{\sim{10}^{6}6}$ was used to achieve strong coupling between a single microwave photon in the waveguide and a collective hyperfine qubit state in the ensemble.
Single-particle-sensitive imaging of freely propagating ultracold atoms
Robert Bücker,Aurélien Perrin,Stephanie Manz,Thomas Betz,Ch. Koller,Thomas Plisson,Joerg Rottmann,Thorsten Schumm,Jörg Schmiedmayer +8 more
TL;DR: In this article, a novel imaging system for ultracold quantum gases in expansion is presented, where atoms fall through a sheet of resonant excitation laser light and the emitted fluorescence photons are imaged onto an amplified CCD camera using a high numerical aperture optical system.
133
Two-point phase correlations of a one-dimensional bosonic Josephson junction.
Thomas Betz,Stephanie Manz,Robert Bücker,Tarik Berrada,Ch. Koller,Georgy A. Kazakov,Georgy A. Kazakov,Igor Mazets,Igor Mazets,Hans-Peter Stimming,Aurélien Perrin,Aurélien Perrin,Thorsten Schumm,Thorsten Schumm,Jörg Schmiedmayer +14 more
TL;DR: A one-dimensional Josephson junction is realized using quantum degenerate Bose gases in a tunable double well potential on an atom chip to measure the coupling strength and temperature and hence a full characterization of the system.
118
Using graphene conductors to enhance the functionality of atom chips
K. Wongcharoenbhorn,R. Crawford,N. Welch,Feiran Wang,German A. Sinuco-León,Peter Krüger,F. Intravaia,Ch. Koller,T. M. Fromhold +8 more
TL;DR: In this paper, the performance and functionality of atom-chips can be transformed by using graphene-based van der Waals heterostructures to overcome present limitations on the lifetime of the trapped atom cloud and on its proximity to the chip surface.
6
Electron beam driven alkali metal atom source for loading a magneto-optical trap in a cryogenic environment
Stefan Haslinger,Robert Amsüss,Ch. Koller,Christoph Hufnagel,N Lippok,Johannes Majer,J. Verdú,S. Schneider,Jörg Schmiedmayer +8 more
TL;DR: In this paper, a magneto-optical trap (MOT) was used to release alkali metal atoms from a magnetorotically-driven source, which can be implemented in cryostats.
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