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LOCATION:Auditorium
SUMMARY:ICFO | MARINA FRAUENDORF CENNI
CLASS:PUBLIC
DESCRIPTION:&nbsp\;\nThe advent of quantum mechanics\, which predicted stra
 nge\, counter-intuitive effects and phenomena\, that could not be mimicked
  by classical physical theories\, revolutionized the scope and understandi
 ng of physics research back in the XIX century. As time passed\, and quant
 um theory became better understood\, a shift of paradigm occurred: what us
 ed to be solely an object of investigation and analysis became also a tool
 \, as it was realized that the extraordinary\, exotic features of systems 
 working in the quantum regime could also be harnessed as resources that co
 uld be used to our benefit in different tasks. This shift of paradigm mark
 ed the beginning of a Second Quantum Revolution\, which was characterized 
 by the rise of the Quantum Information Science and Technologies. Central q
 uantum resources such as quantum correlations\, including entanglement\, a
 nd also non-classicality and non-Gaussianity\, were shown to be useful for
  data processing tasks such as communication\, computation and parameter e
 stimation\, to name a few. In this thesis\, we dive into the field of para
 meter estimation\, or Metrology\, and discuss the role of physical correat
 ions on the precision of the information retrieval of variables encoded in
  physical systems. We begin by exploring the role of a specific kind of co
 rrelations\, those that arise indirectly between quantum probes via the in
 teraction with a common environment\, in the retrieval of temperature info
 rmation of a cold bosonic bath. We then analyse the role of restricting th
 e measurement choice of the probes to a limited set\, that of Gaussian mea
 surements\, and show their usefulness in characterizing the temperature of
  Gaussian systems. Finally\, we go beyond the scope of the field of Metrol
 ogy and Thermometry\, and look for effective ways to certify the presence 
 of a number of relevant quantum resources in states produced by third orde
 r light-matter interaction\, also known as three photon generation. There\
 , we show that correctly tailored quantum witnesses can effectively certif
 y the presence of quantum phenomena with no classical analog in photonic n
 onlinear processes.\n&nbsp\;\nMonday November 25\, 10:00 h. ICFO Auditoriu
 m\nThesis Director: Prof. Dr. Antonio Ac&iacute\;n
DTSTAMP:20260407T073753Z
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