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VERSION:2.0
PRODID:Icfo
X-PUBLISHED-TTL:P1W
BEGIN:VEVENT
UID:69f342019663b
DTSTART:20250306T140000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20250306T150000Z
LOCATION:Seminar Room
SUMMARY:ICFO | ISAAC DAVID SMITH 
CLASS:PUBLIC
DESCRIPTION:Consider a quantum network consisting of several nodes\, repres
 enting quantum systems\, and connections between them. What quantum states
  can be prepared in such a network? In the context of quantum causality\, 
 this problem can be phrased as a causal compatibility problem: the network
 s represent a causal structure and a given multipartite quantum state is c
 ompatible with the network if there exist channels and input states that (
 i) produce the given state in question and (ii) respect the causal structu
 re. In this talk\, I will present a method for demonstrating the incompati
 bility of quantum states with certain networks. This method builds upon an
  existing technique developed for causal inference\, known as the inflatio
 n technique\, and makes use of operator inequalities developed for the qua
 ntum marginal problem. &nbsp\;The result is a process by which one can der
 ive witnesses of incompatibility with certain networks/causal structures\,
  amenable to both numerically and analytically specified quantum states. I
  showcase the utility of such witnesses by demonstrating the incompatibili
 ty of various quantum states with the network known as the triangle scenar
 io.
DTSTAMP:20260430T115025Z
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