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SUMMARY:Time symmetry in operational quantum theory - Lucien Hardy\, Perim
 eter Institute for Theoretical Physics
DTSTART:20220303T141500Z
DTEND:20220303T151500Z
UID:TALK169748@talks.cam.ac.uk
CONTACT:Damian Pitalua-Garcia
DESCRIPTION:The standard operational probabilistic framework (within which
  Quantum Theory can be formulated) is time asymmetric. This is clear becau
 se the conditions on allowed operations include a time asymmetric causalit
 y condition.  This causality condition enforces that future choices do not
  influence past events.  To formulate operational theories in a time symme
 tric way I modify the basic notion of an operation allowing classical inco
 mes as well as classical outcomes.  I provide a new time symmetric causali
 ty condition which I call double causality.  I apply these ideas to Quantu
 m Theory proving\, along the way\, a time symmetric version of the Stinesp
 ring extension theorem using double causality.  I also propose the idea of
  a conditional frame of reference.  We can transform from the time symmetr
 ic frame of reference to a forward or a backward frame of reference.  This
  talk is based on arXiv:2104.00071.
LOCATION:Zoom
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