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X-PUBLISHED-TTL:P1W
BEGIN:VEVENT
UID:6ab30153a3d5b
DTSTART:20240612T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20240612T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | FLAVIO DEL SANTO
CLASS:PUBLIC
DESCRIPTION:Naive attempts to put together relativity and quantum measureme
 nts lead to signaling between space-like separated regions. In QFT\, these
  are known as impossible measurements. We show that the same problem arise
 s in non-relativistic quantum physics\, where joint nonlocal measurements 
 (i.e.\, between systems kept spatially separated) in general lead to signa
 ling\, while one would expect no-signaling (based for instance on the prin
 ciple of no-nonphysical communication). This raises the question: Which no
 nlocal quantum measurements are physically possible? We review and develop
  further a non-relativistic quantum information approach developed indepen
 dently of the impossible measurements in QFT\, and show that these two hav
 e been addressing virtually the same problem. The non-relativistic solutio
 n shows that all nonlocal measurements are localizable (i.e.\, they can be
  carried out at a distance without violating no-signaling) but they (i) ma
 y require arbitrarily large entangled resources and (ii) cannot in general
  be ideal\, i.e.\, are not immediately reproducible. These considerations 
 could help guide the development of a complete theory of measurement in QF
 T.
DTSTAMP:20260922T222939Z
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