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DTSTART;TZID=America/Toronto:20230626T100000
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/jack-davis-
 phd-thesis-defence
LOCATION:PHY 308 200 University Avenue West Waterloo ON N2L 3G1 Canada
SUMMARY:Jack Davis PhD Thesis Defence
CLASS:PUBLIC
DESCRIPTION:WIGNER NEGATIVITY ON THE SPHERE\n\nThe rise of quantum informat
 ion theory has largely vindicated the\nlong-held belief that Wigner negati
 vity is an indicator of genuine\nnonclassicality in quantum systems.  Thi
 s thesis explores its\nmanifestation in spin-j systems using the spherical
  Wigner function. \nCommon symmetric multi-qubit states are studied and c
 ompared.  Spin\ncoherent states are shown to never have vanishing Wigner 
 negativity. \nPure states that maximize negativity are determined and ana
 lyzed using\nthe Majorana stellar representation.  The relationship betwe
 en\nnegativity and state mixedness is discussed\, and polytopes\ncharacter
 izing unitary orbits of lower-bounded Wigner functions are\nstudied.  Res
 ults throughout are contrasted with similar works on\nsymmetric state enta
 nglement and other forms of phase-space\nnonclassicality.
DTSTAMP:20260426T025448Z
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