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DTSTART:20221212T140000Z
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LOCATION:ICFO Auditorium and Online (Teams)
SUMMARY:ICFO | PAOLO ABIUSO 
CLASS:PUBLIC
DESCRIPTION:In this thesis\, we study the optimization of operational tasks
  that involve the manipulation of quantum resources. In most cases\, such 
 optimizations are aided by understanding the geometric properties of the p
 hysical objects involved. We split our results in a first part concerning 
 Thermodynamics\, and a second part concerning Information Theory.&nbsp\;\n
 In the context of Thermodynamics\, we first study the optimization of ther
 mal machines. That is\, we look for those periodic control protocols\, per
 formed on a quantum working fluid\, that maximize figures of merit based o
 n power and efficiency. By making small assumptions on the dynamical regim
 es (of low-dissipation/slow-driving\, or fast-driving)\, we are able to co
 nstruct and characterize optimal protocols that are valid for large classe
 s of quantum (and classical) thermal machines.\nSecondly\, we study how to
  design quantum thermal probes that optimize the precision in temperature 
 estimation when put in contact with a thermal bath. The resulting optimal 
 configurations are simple and physically feasible\, and show an Heisenberg
 -like scaling of the optimal sensitivity.\nIn the context of Information T
 heory\, initially we study how to characterize memory effects (information
  backflows) in the dynamics of open quantum systems\, how to detect them a
 nd operationally exploit them.\nFurthermore\, in the subfield of Nonlocali
 ty\, we study relaxations and generalisation of the canonical Bell scenari
 o\, which allow us to bring the realization of nonlocal experiments closer
  to simple\, table-top quantum optics. In particular\, by considering nonl
 ocality in quantum networks\, we are able to design an experiment which on
 ly involves simple passive optics and single-photon entangled states\, in 
 which it is possible to certify nonlocality without measurement inputs. Li
 kewise\, a different relaxation consists in allowing trusted quantum input
 s in a Bell experiment. This permits certifying nonlocality of any entangl
 ed state\, without trusting the measurement device. We study this measurem
 ent-device-independent framework to design simple protocols of entanglemen
 t detection for continuous-variable states.\nThe results of the thesis are
  relevant both from the theoretical point of view and for the efficient re
 alisation of the operational tasks analysed.\n&nbsp\;\nThesis Director:&nb
 sp\;&nbsp\;ICREA Prof Dr Antonio Ac&iacute\;n
DTSTAMP:20260426T121936Z
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