Interferometry with Interacting Bose-Einstein Condensates in a Double-Well Potential, Softcover reprint of the original 1st ed. 2016
Springer Theses Series

This thesis demonstrates a full Mach?Zehnder interferometer with interacting Bose?Einstein condensates confined on an atom chip. It relies on the coherent manipulation of atoms trapped in a magnetic double-well potential, for which the author developed a novel type of beam splitter. Particle-wave duality enables the construction of interferometers for matter waves, which complement optical interferometers in precision measurement devices, both for technological applications and fundamental tests. This requires the development of atom-optics analogues to beam splitters, phase shifters and recombiners.

Particle interactions in the Bose?Einstein condensate lead to a nonlinearity, absent in photon optics. This is exploited to generate a non-classical state with reduced atom-number fluctuations inside the interferometer. This state is then used to study the interaction-induced dephasing of the quantum superposition. The resulting coherence times are found to be a factor of three longer than expected for coherent states, highlighting the potential of entanglement as a resource for quantum-enhanced metrology.

Introduction.- Theoretical Framework.- Experimental Setup and Techniques.- A Mach-Zehnder Interferometer for Trapped, Interacting Bose-Einstein Condensates.- Outlook: Bosonic Josephson Junctions Beyond the Two-Mode Approximation.

Nominated as an outstanding Ph.D. thesis by the Vienna University of Technology, Austria

Presents a matter-wave interferometer for use in precision measurements

Highlights the potential of BECs and their manipulation in quantum-enhanced metrology

Includes supplementary material: sn.pub/extras