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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-6914
DTSTART:20220408T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T145149Z
LAST-MODIFIED:20220404T210734Z
LOCATION:Chamberlin 5280
SUMMARY:Hot Qubits on the Horizon\, Theory Seminar (High Energy/Cosmol
 ogy)\, Greg Kaplanek\, McMaster University\, Perimeter Institute
DESCRIPTION:Perturbation theory for gravitating quantum systems tends 
 to fail at very late times (a type of perturbative breakdown known as 
 secular growth). We argue that gravity is best treated as a medium/env
 ironment in such situations\, where reliable late-time predictions can
  be made using tools borrowed from quantum optics. To show how this wo
 rks\, we study the explicit example of a qubit hovering just outside t
 he event horizon of a Schwarzschild black hole (coupled to a real scal
 ar field) and reliably extract the late-time behaviour for the qubit s
 tate. At very late times\, the so-called Unruh-DeWitt detector is show
 n to asymptote to a thermal state at the Hawking temperature.
URL:https://www.physics.wisc.edu/events/?id=6914
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