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UID:6a31f49f5460b
DTSTART:20250619T130000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20250619T140000Z
LOCATION:Seminar Room
SUMMARY:ICFO | ALEJANDRO POZAS-KERSTJENS
CLASS:PUBLIC
DESCRIPTION:Joint measurements are pivotal in quantum theory\, featuring pr
 ominently in key quantum information primitives such as entanglement swapp
 ing\, teleportation\, and dense coding. A historically important question 
 has been whether joint measurements can be performed at a distance\, witho
 ut bringing together the particles to be measured. The original motivation
  for asking this was understanding whether the measurement process in quan
 tum mechanics is compatible with relativity\, which was already put into q
 uestion by Landau and Peierls in 1933. However\, its interest is not only 
 fundamental\, since being able to perform joint measurements locally will 
 have a strong impact in the development of protocols for quantum communica
 tion and distributed quantum computing.  In this talk I will describe a pr
 otocol for localizing any joint quantum measurement\, given sufficient pre
 -shared entanglement. Because the protocol consists on multiple rounds of 
 blind teleportation\, the amount of rounds needed for localizing a given m
 easurement can be understood as a measure of its complexity. Thus\, we giv
 e the first complete classification of joint quantum measurements. I will 
 show that many of the joint measurements that are now routinely studied th
 eoretically and implemented experimentally have low complexity according t
 o this measure. This indicates that there are still many interesting pheno
 mena to discover when it comes to joint quantum measurements.
DTSTAMP:20260617T011303Z
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