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- W3095996925 abstract "When light and matter are weakly coupled, they can be described as two distinctive systems exchanging quanta of energy. By contrast, when their coupling strength becomes very large, the systems hybridize and form compounds that cannot be described in terms of light or matter only. In this Thesis, we will study some exotic properties which arise in this regime. In particular, we will be interested in the possibility to engineer quantum phase transitions in these systems. One direction we explore is the study of two-photon coupling, a mechanism in which photons are created or emitted in pairs. This mechanism creates a rich phase diagram containing both phase transitions and instabilities. Another point of interest is the possibility to use these transitions for sensing applications. Indeed, near the critical point, the system becomes extremely sensitive to external perturbations. We will present a protocol in which a single qubit coupled to a bosonic field. Despite its simplicity, this system displays a phase transition. Near the critical point, both the frequency of the qubit and the field can be measured with improved accuracy. Hence, finite-size transitions could be used to develop small-scale sensors. As last topic, we study how the ability of a system to perform certain metrological tasks could be used to characterize and quantify nonclassicality, by using the formalism of resource theories." @default.
- W3095996925 created "2020-11-09" @default.
- W3095996925 creator A5056136229 @default.
- W3095996925 date "2020-10-02" @default.
- W3095996925 modified "2023-09-27" @default.
- W3095996925 title "Phase transitions in light-matter systems for quantum sensing" @default.
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