We propose a two-qubit collisional phase gate that can be implemented with available atom
chip technology and present a detailed theoretical analysis of its performance. The gate is …

We experimentally demonstrate that one-dimensional Bose-Einstein condensates brought
close to microfabricated wires on an atom chip are a very sensitive sensor for magnetic and …

We demonstrate spatially resolved, coherent excitation of Rydberg atoms on an atom chip.
Electromagnetically induced transparency (EIT) is used to investigate the properties of the …

During the past few decades, abundant evidence for physics beyond the two standard
models of particle physics and cosmology was found. Yet, we are tapping in the dark …

We analyze the magnetic dipole contribution to atom-surface dispersion forces. Unlike its
electrical counterpart, it involves small transition frequencies that are comparable to thermal …

We develop an effective low-frequency theory of the electromagnetic field in equilibrium with
thermal objects. The aim is to compute thermal magnetic noise spectra close to metallic …

In this thesis, I report experiments and theoretical work on the coherent manipulation of
ultracold atoms on an atom chip. We experimentally investigate the effect of the atom chip …

We have measured the trapping lifetime of magnetically trapped atoms in a cryogenic atom-
chip experiment. An ultracold atomic cloud is kept at a fixed distance from a thin gold layer …

We present a detailed, realistic analysis of the implementation of a proposal for a quantum
phase gate based on atomic vibrational states, specializing it to neutral rubidium atoms on …

We propose a long-lived and rapidly accessible quantum memory unit, for which the
operational Hilbert space is spanned by states involving the two macroscopically occupied …