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Title: Dissipative engineering of cold atoms in optical lattices
Author: Malo, Jorge Yago
ISNI:       0000 0004 7967 2722
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2019
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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 allows us to model them. 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. In this thesis, we investigate several important examples of dissipative many-body dynamics. The first one relates to 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. In the second topic we explore, 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. The third topic that we include in this thesis focuses 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. In all these projects, we make use of tensor network techniques to tackle the open system dynamics combining matrix product states and matrix product operator approaches, in both cases, exploiting symmetries in the system to optimize the numerical performance. All in all, the application of open system ideas to the study of quantum many-body problems provides not only an improved description of the realistic scenario but also can give access novel tools to engineer cold atomic systems in regimes that are not accessible for closed systems.
Supervisor: Daley, Andrew Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral