Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Quantum Gases: Bosons III
Q 29.4: Vortrag
Mittwoch, 2. März 2016, 12:00–12:15, e001
Enhanced Quantum Simulation of Quantum Phase Transitions using Non-Destructive Measurements — •Robert Heck1, Mark Bason2, Ottó Elíasson1, Romain Müller1, Mario Napolitano1, Aske R. Thorsen1, Jan Arlt1, and Jacob F. Sherson1 — 1Institute of Physics and Astronomy, Aarhus University, Denmark — 2School of Physics and Astronomy, University of Nottingham, United Kingdom
In the age of quantum simulation, experiments must give as tight bounds as possible to guide the construction of theoretical models describing complex many-body quantum systems.
We report on three separate investigations using Faraday imaging, a method relying on the dispersive light-matter interaction: Firstly, we report that the shot-to-shot fluctuating initial conditions in the cold atomic cloud deterministically shift the transition point to a BEC. Then we demonstrate that precise knowledge of these initial conditions lead to enhanced precision in the determination of the transition point. Secondly, we probe the dynamics of the condensation process by repeated in-situ Faraday imaging of the same cloud. We quantify experimental sources of noise and demonstrate that the transition point depends on the number of probe photons in a deterministic manner. This is an important step towards the direct observation of the stochastic nature of the condensation process, due to bosonic stimulation. Finally, as a step towards single shot mapping of entire phase diagrams, we quasi-conservatively drive the transition to a BEC up to 30 times using repeated application of a tightly focused laser beam.