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 20 of 36 for “"Neutral Atoms"”.
-
Control of neutral atoms in optical lattices
Neutral atoms are promising candidates to store and manipulate quantum information. In this thesis we examine several problems related to the control of neutral atoms for quantum computation and simulation. In the first problem we show how the transport of atoms in an optical lattice can be …
-
A quasi-electrostatic trap for neutral atoms
… `quasi-elektrostatische' Atomfalle (QUEST) fuer neutrale Atome realisiert. Caesium und Lithium wurden gemeinsam gespeichert und damit erstmals die Mischung verschiedener Spezies in einer optischen Dipolfalle demonstriert. Die Falle wird durch den Fokus eines CO2-Laser Strahls mit 30 W …
-
Long-distance quantum communication with neutral atoms
… that have the common feature of employing neutral atoms for storage/processing and photons for qubit transmission. For most of these systems, there is a lack of a precise performance analysis to enable a comparison between different scenarios from a top-level system standpoint. One main …
-
Energy Distribution of Sputtered Neutral Atoms from a Multilayer Target
Energy distribution measurements of sputtered neutral particles contribute to the general knowledge of sputtering, a common technique for surface analysis. In this work emphasis was placed on the measurement of energy distribution of sputtered neutral atoms from different depths. The liquid Ga-In …
-
Locally Tuneable Quantum Hamiltonians with Neutral Atoms in Optical Lattices
Neutral atoms in optical lattices are powerful and versatile quantum simulators of quantum lattice models with many applications. While they have successfully realised many translationally invariant models, the ability to locally tune all local Hamiltonian parameters remains an outstanding goal …
-
A Trapped Single Ion Inside a Bose-Einstein Condensate
… and internal quantum states of ultracold neutral atoms and ions has opened intriguing possibilities for quantum simulation and quantum computation. Many-body effects have been explored with hundreds of thousands of quantum-degenerate neutral atoms and coherent light-matter interfaces have …
-
Loading a planar RF Paul Trap from a cold Yb⁺ source
… that have been photoionized from a source of neutral atoms, which were cooled in a magneto-optical trap. Planar ion traps have only recently been successfully loaded[1], and never from a cold ion source. Additionally, ionizing directly from a MOT allows for isotope selection.
-
High current ion emission in electrohydrodynamic spraying
… Quantities measured include the number of neutral atoms emitted with the ions, the spectrum of the light which accompanies ion emission, the energy and mass spectra of the emitted ions, and the effect on the emission of secondary electrons and residual gas in the vacuum chamber. Some …
-
Experimental demonstration of high-fidelity entanglement via Rydberg blockade
The strong dipole interactions of Rydberg atoms are ideal candidates to facilitate interactions between neutral atoms to generate entanglement for quantum information processing. This offers the potential to scale to large atom arrays through well established techniques for neutral atoms, …
-
Magic Trapping of a Three-Level System for Rydberg Quantum Computation
… which stores qubits in optically trapped neutral atoms. A detailed theory for these optical traps is presented. While the traps are essential, they induce decoherence in the atoms they trap. We propose a method of "magic" trapping by which this decoherence may be completely removed. …
-
Coherent matter waves near surfaces
Neutral atoms can be trapped and manipulated on microscopic scales near surfaces of atom chips. The work covered by this thesis includes the development and test of microscopic atom optical tools. An omni-directional magnetic matter wave guide and novel types of magneto-electric trapping potentials …
-
Experiments Towards the Realization of a Nanofiber Guided Dipole Trap
… enables optical fields to interface with trapped neutral atoms in their vicinity. In such a configuration, the guided light exhibits a large portion of evanescent field into the vacuum thus laser cooled atoms can couple to the fiber mode. By trapping and cooling atoms around the nanofiber I …
-
Development, Fabrication and Characterisation of Atom Chips
… 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 created on the atom chip. Therefore atom chips with high quality surfaces and extremely well defined wires were build …
-
Characterization of heat-treated nickel and gold films on silicon single crystals
… was used to determine the presence of various neutral atoms and molecules on metallized and bare surfaces of silicon wafers. The metallization consisted of thin films of nicke l and gold separately and in combination. The major surface contaminates on all samples were found to be F, Na, Cl, K, …
-
Scalable Surrogates for Counts and Computer Experiments
… recording counts of heliospheric energetic neutral atoms (ENAs), exhibit a phenomenon that has caused space scientists to revise hypotheses about the physical processes, and computer simulations under those models, that are in play at the boundary of our solar system. Providing estimates and …
-
The cold atom toolbox in momentum space
… a more controlled environment. Our field of cold neutral atoms in optical lattices has seen success over many years as a platform for quantum simulation of various lattice models from condensed matter physics. The recent (2015) implementation of lattices not in position, but in a synthetic …
-
Partially ionized plasma transport and line radiation interactions as the tokamak edge
… the charge-exchange coupling of ions with neutral atoms, the transport of potential energy, the effects of resonance line radiation interactions on atomic rates, and the transport of an arbitrary number of atomic levels, is developed and coupled with an existing NLTE radiation transport …
-
Probing and preparing novel states of quantum degenerate rubidium atoms in optical lattices
Ultracold atoms in optical lattices are promising systems to realize and study novel quantum mechanical phases of matter with the control and precision offered by atomic physics. Towards this goal, as important as engineering new states of matter is the need to develop new techniques to probe these …
-
Double-Loop Microtrap Array for Ultracold Atoms
… magnetic 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 …
-
A Cavity-Coupled Rydberg Atom Array for Quantum Science and Quantum Computing
Neutral atom arrays have rapidly emerged as a leading platform for quantum computing, boasting scalable, configurable arrays of single atoms trapped in optical tweezers, fast, high-fidelity entangling gates through Rydberg interactions, and programmable, parallelized control of qubit operations. …
Page 1 of 2