BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Symmetry transformations beyond Wigner's theorem - Dr Sarah Croke 
 (Glasgow)
DTSTART:20240628T110000Z
DTEND:20240628T120000Z
UID:TALK217516@talks.cam.ac.uk
CONTACT:Adrian Kent
DESCRIPTION:Wigner's theorem is a foundational result in quantum mechanics
 \, which establishes that symmetry transformations are represented by eith
 er unitary or anti-unitary operators. Physically\, this is to ensure that 
 observable quantities\, namely the square overlap between any two states\,
  are preserved under a symmetry transformation. In this talk I will discus
 s symmetries and their importance in Physics\, and introduce Wigner's theo
 rem. I will then propose transformations which are neither unitary nor ant
 i-unitary\, motivate these as valid symmetry transformations\, and discuss
  their physical meaning. The discussion relies on a quantum informational 
 description of reference frames\, thus suggesting an extension of Wigner's
  theorem in the light of a modern approach to quantum measurement.
LOCATION:MR14
END:VEVENT
END:VCALENDAR