Disentangling chaos, scrambling and thermalisation in ultracold atoms
Speaker: Ryan Kidd
Affiliation: University of Queensland
Abstract
Thermalisation and its connection to the dynamics of quantum information, correlations, and quantum entanglement is a current research front in quantum many-body physics. The exponential growth of out-of-time-order correlators (OTOCs), or scrambling, is sometimes taken as an indicator of chaos and thermalisation in quantum systems, despite the fact that saddle points in integrable systems can also drive rapid growth in OTOCs. In this talk, I will discuss my work on the connections between dynamical chaos, quantum information scrambling and thermalisation in the absence of an external bath. By analysing the Dicke model and a driven Bose-Hubbard dimer, paradigmatic models in ultracold atoms, I will demonstrate that the OTOC growth driven by chaos can nonetheless be distinguished from that driven by saddle points through the long-term OTOC behaviour and entanglement entropy dynamics.
About Physics Seminars
The weekly Physics Seminar series focuses on a broad range of physics research within SMP, along with frequent presentations from visiting researchers. Seminars are usually scheduled for 1.00pm on Tuesdays.
The talks are typically more specialised than a colloquium but are often attended by staff and PhD students across a broad range of areas. Speakers are thus encouraged to include introductory material in the talks.
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