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SUMMARY:Conditions tighter than non-commutation needed for non-classicalit
 y - Jacob Chevalier Drori\, DAMTP\, University of Cambridge
DTSTART:20201016T100000Z
DTEND:20201016T110000Z
UID:TALK151261@talks.cam.ac.uk
CONTACT:40340
DESCRIPTION:Kirkwood discovered in 1933\, and Dirac discovered in 1945\, a
  representation of quantum states that has undergone a renaissance recentl
 y. The Kirkwood-Dirac (KD) distribution has been employed to study nonclas
 sicality across quantum physics\, from metrology to chaos to the foundatio
 ns of quantum theory. The KD distribution is a quasiprobability distributi
 on\, a quantum generalization of a probability distribution\, which can be
 have nonclassically by having negative or nonreal elements. Negative KD el
 ements signify quantum information scrambling and potential metrological q
 uantum advantages. Nonreal elements encode measurement disturbance and the
 rmodynamic nonclassicality. KD distributions’ nonclassicality has been b
 elieved to follow necessarily from noncommutation of operators. We show th
 at noncommutation does not suffice. We prove sufficient conditions for the
  KD distribution to be nonclassical (equivalently\, necessary conditions f
 or it to be classical). We also quantify the KD nonclassicality achievable
  under various conditions. This work resolves long-standing questions abou
 t nonclassicality and may be used to engineer quantum advantages.\n\nRefer
 ences\n\n1) https://arxiv.org/abs/2009.04468 \n\nZoom Link\n\nPlease click
  the link below to join the webinar:\nhttps://us02web.zoom.us/j/8684652145
 1?pwd=M0VUSE5wTEJwSndCbEx0VUtqNHpuZz09\nPasscode: 226745\n
LOCATION:Virtually\, at Zoom
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