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Title

Precision engineering for ultra-cold atoms and space experiments

Alternative Title

Μηχανική ακριβείας υπερψυχρών ατόμων και διαστημικών πειραμάτων

Author

Δρουγκάκης, Ιωάννης

Thesis advisor

Παπάζογλου, Δημήτριος

Abstract

Ultra-cold atom technologies promise significant improvements in the fields of sensing, com- munication, quantum simulation, and computation. In order to fully exploit their capabilities, many new technologies need to be developed. In this thesis I focus on three of them: precision engineering of the guiding potentials, precision engineering of the input state for the atom sensor, and ultra-stable and robust optical technologies for atom quantum space missions. These three main challenges of the field are investigated in this thesis. First, I explore the limits of excitationless transport of Bose-Einstein condensates (BECs) and thermal ultra-cold atomic ensembles in magnetic time-averaged potential (TAAP) ring- shaped waveguides by artificially introducing obstacles in the waveguide. We find that over a broad plateau no exci- tation occurs up to a threshold value of roughness, where an abrupt increase in the excitation of the atomic cloud is observed. I also present a robust and simple detection method, with only 1% error in the measurement of the atom number. This constitutes an improvement of about 10 in the precision of our experimental sequence. The method has potential as a minimally destructive measurement technique for the quantum state and the temperature of the ultra-cold cloud. Finally, a space-compatible optical fiber link was developed for atom quantum space missions. High coupling efficiency of the order of 94% and RMS fluctua- tions of less than 1% in the presence of 30K temperature fluctuations and vibrations were achieved. These demonstrations pave the way towards the realization of practical devices based on ultra-cold atoms.

Language

English

Subject

Cold atom detection

Space instrumentation

Διαστημικές διατάξεις

Issue date

2021-11-26

Collection

School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses

Type of Work--Doctoral theses

Views

386

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