Dissipative engineering of cold atomic systems (Dr. Jorge Yago)

Dissipative engineering of cold atomic systems

Datum: 30.01.2019
Uhrzeit: 11:30
Vortragende(r): Dr. Jorge Yago
Department of Physics, University of Strathclyde, Glasgow, Scotland, UK
Ort: Max Planck Institute of Quantum Optics
Raum: Hörsaal, Raum B 0.32 / New lecture hall, Room B 0.32

Cold atom systems in optical lattices provide a promising platform for a wide variety of applications, ranging from quantum simulation to quantum metrology, due to their extremely high tunability and the ability to derive microscopic models under well-controlled approximations that give access to accurate descriptions. The proper characterization of those systems requires, in many scenarios, taking into account that they are subject to some dissipation sources, as dissipation can drastically modify the behaviour of the known phases of matter or even generate new ones. However, the description of open systems can quickly become numerically unaffordable.

In this talk, we investigate several important examples of dissipative many-body dynamics combining matrix product states and matrix product operator approaches. First, we focus on the study of one-dimensional spinless fermions and hard-core bosons. We observe how dissipation induces differences in local observables that are identical in the closed system. secondly, we focus on characterizing the role of dissipation, specifically particle loss and dephasing, in the long-time behaviour of many-body localized systems. We analyze under which conditions dissipation leads to thermalization in the localized phase. The last part of the talk presents an example of the use of engineered coupling to the environment, both coherent and dissipative, to robustly create spin-symmetric fermionic states. This scheme, which combines a Raman transfer between Bloch bands and sympathetic cooling with a reservoir gas, prepares entangled states that exhibit quantum enhanced precision for metrology.