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Ultra-cold atomic ensembles have emerged in recent years as a powerful tool in many-body physics research, quantum information science and metrology. This thesis presents an experimental and theoretical study of the coherent properties of trapped atomic ensembles at high densities, which are essential to many of the aforementioned applications. The study focuses on how inter-particle interactions modify the ensemble coherence dynamics, and whether it is possible to extend the coherence time by means of external control. The thesis presents a theoretical model which explains the effect of elastic collision of the coherence dynamics and then reports on experiments which test this model successfully in the lab. Furthermore, the work includes the first implementation of dynamical decoupling with ultra-cold atomic ensembles. It is demonstrated experimentally that by using dynamical decoupling the coherence time can be extended 20-fold. This has a great potential to increase the usefulness of these ensembles for quantum computation.

Collisions (Nuclear physics). --- Low temperatures. --- Nuclear physics. --- Quantum theory. --- Collisions (Nuclear physics) --- Low temperatures --- Quantum theory --- Physics --- Physical Sciences & Mathematics --- Atomic Physics --- Electricity & Magnetism --- Thermodynamics --- Nuclear excitation. --- Excitation, Nuclear --- Atomic nuclei --- Atoms, Nuclei of --- Nucleus of the atom --- Physics. --- Quantum physics. --- Atoms. --- Low temperature physics. --- Quantum computers. --- Spintronics. --- Atomic, Molecular, Optical and Plasma Physics. --- Quantum Information Technology, Spintronics. --- Quantum Physics. --- Low Temperature Physics. --- Energy levels (Quantum mechanics) --- Nuclear physics --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Cryogenics --- Low temperature physics --- Temperatures, Low --- Temperature --- Cold --- Fluxtronics --- Magnetoelectronics --- Spin electronics --- Spinelectronics --- Microelectronics --- Nanotechnology --- Computers --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Chemistry, Physical and theoretical --- Matter --- Stereochemistry --- Constitution

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Ultra-cold atomic ensembles have emerged in recent years as a powerful tool in many-body physics research, quantum information science and metrology. This thesis presents an experimental and theoretical study of the coherent properties of trapped atomic ensembles at high densities, which are essential to many of the aforementioned applications. The study focuses on how inter-particle interactions modify the ensemble coherence dynamics, and whether it is possible to extend the coherence time by means of external control. The thesis presents a theoretical model which explains the effect of elastic collision of the coherence dynamics and then reports on experiments which test this model successfully in the lab. Furthermore, the work includes the first implementation of dynamical decoupling with ultra-cold atomic ensembles. It is demonstrated experimentally that by using dynamical decoupling the coherence time can be extended 20-fold. This has a great potential to increase the usefulness of these ensembles for quantum computation.

Quantum mechanics. Quantumfield theory --- Plasma physics --- Matter physics --- Spectrometric and optical chemical analysis --- molecuulfysica --- quantumfysica --- plasmafysica --- electron spin resonance spectre --- informatietechnologie --- atoomfysica