179 citations · 264 across the 6 of their papers we have counts for
7 papers
Secure distribution of a certified random quantum key using an entangled memory qubit
Pascal Kobel, Ralf A. Berner, Michael Köhl
Random generation and confidential distribution of cryptographic keys are fundamental building blocks of secure communication. Using quantum states in which the transmitted quantum…
Slow interaction quench in BCS superconductors: emergence of pre-formed pairs
Johannes Kombe, Jean-Sebastien Bernier, Michael Köhl +1
We investigate the non-equilibrium behavior of BCS superconductors subjected to slow ramps of their internal interaction strength. We identify three dynamical regimes as a function…
Isotope shift and hyperfine splitting of the transition in potassium
Alexandra Behrle, Marco Koschorreck, Michael Köhl
We have investigated transition ( line) of the potassium isotopes K, K, and K using Doppler-free laser saturatio…
Getting into Shape: Efficient Cooling Scheme for Fermionic Atoms in Optical Lattices
Jean-Sebastien Bernier, Corinna Kollath, Antoine Georges +4
We propose an experimental procedure to cool fermionic atoms loaded into an optical lattice. The central idea is to spatially divide the system into entropy-rich and -poor regions…
Critical Behavior of a Trapped Interacting Bose Gas
Tobias Donner, Stephan Ritter, Thomas Bourdel +3
The phase transition of Bose-Einstein condensation is studied in the critical regime, when fluctuations extend far beyond the length scale of thermal de Broglie waves. Using matter…
Scanning tunnelling microscopy for ultracold atoms
Corinna Kollath, Michael Köhl, Thierry Giamarchi
We propose a novel experimental probe for cold atomic gases analogous to the scanning tunnelling microscope (STM) in condensed matter. This probe uses the coherent coupling of a si…