Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"Atom chip"”.
-
Towards an integrated atom chip
The field of atom chips is a relatively new area of research which is rapidly becoming of great interest to the scientific community. It started out as a small branch of cold atom physics which has quickly grown into a multidisciplinary subject. It now encompasses topics from fundamental atomic and …
-
Development, Fabrication and Characterisation of Atom Chips
Atom chips are robust and extremely powerful toolboxes for quantum optical experiments, since they make it possible to create exceedingly precise magnetic traps for neutral atoms with minimal field modulations. Accurate manipulation of trapped atoms is feasible with magnetic and electric fields …
-
One-dimensional Bose-Einstein condensates in micro-traps
… which enables to collect up to 3x10^8 cold atoms close to the reflecting surface of an atom chip. These atoms are subsequently transferred to micro-traps generated by wires mounted on the atom chip and Bose-Einstein condensation has been achieved. The Bose-Einstein condensates (BECs) created …
-
Bose-Einstein condensation in a robust microtrap -- the combination of wire traps and atom chips
… for the small wire traps we use the so called atom chip. This combination is promising, because it allowed us to develop a condensation process in the copper structure, which is independent of the structures on the atom chip, and thus the exchange of the 'physics' area. First experiments with …
-
Double-Loop Microtrap Array for Ultracold Atoms
… microtrap is demonstrated for ultracold neutral atoms. It consists of two concentric loops of radii $r_1$ and $r_2$ having oppositely oriented currents. A magnetic field minimum is generated in three dimensions that can be used to trap the atoms with a trap depth of about 1 mK using a current of …
-
Quantum coherence and magnetism in bosonic and fermionic gases of ultracold atoms
… in a strongly interacting Fermi gas of ultracold atoms. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. Our observations imply that itinerant …
-
The integration of fibre optics for atom chips
… integration of fibre optics components for the atom chip, a device developed to manipulate matter on the atomic scale for the purpose of quantum information processing, novel applications, and fundamental research. Following in the direction of the electronics industry, miniaturisation has …
-
Magnetic fields near microstructured surfaces : application to atom chips
Microfabricated solid-state surfaces, also called atom chip', have become a well-established technique to trap and manipulate atoms. This has simplified applications in atom interferometry, quantum information processing, and studies of many-body systems. Magnetic trapping potentials with arbitrary …
-
Fluctuation-mediated interactions of atoms and surfaces on a mesoscopic scale
… fluctuations of the electromagnetic near field of atoms and macroscopic bodies play a key role in quantum electrodynamics (QED), as in the Lamb shift. They lead, e.g., to atomic level shifts, dispersion interactions (Van der Waals-Casimir-Polder interactions), and state broadening (Purcell effect) …
-
Experiments with Bose-Einstein condensates in a double-well potential
Trapped atom interferometry was demonstrated with Bose-Einstein condensates in an optical double-well trap. Coherent splitting of trapped condensates was performed by deforming an optical single-well potential into a double-well potential, and the relative phase of the two split condensates was …
-
Microtraps and waveguides for Bose-Einstein condensates
… condensates containing up to 3 x 10⁶ ²³Na atoms were loaded into magnetic microtraps and waveguides on a microfabricated "atom chip" using optical tweezers. Single-mode propagation was observed along the waveguide. Closer to the microfabricated surface, perturbations to the waveguide …
-
Bose-Einstein condensates in magnetic double well potentials
… for Bose-Einstein condensates (BECs) on atom chips. One approach utilizes static magnetic traps, created by current carrying micro wires, manipulating the atoms close to the chip surface. As in all other atom chip experiments, cold atom clouds are found to break up to pieces in the …
-
Techniques for engineering quantum states
… theoretically study quantum states of ultracold atoms. The majority of the Chapters focus on engineering specific quantum states of single atoms with high fidelity in experimentally realistic systems. In the sixth Chapter, I investigate the stability and dynamics of new multidimensional solitonic …
-
Magnetic micro-confinement of quantum degenerate gases
… in their phase spaces, such as ultracold atoms and virtual quantum particles. Based on the nature of the interaction between the external confining potential fields and the different types of quantum particles, this research is conducted through two separate but not different phases. We …