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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-9793
DTSTART:20261021T180000Z
DTEND:20261021T193000Z
DTSTAMP:20261008T113838Z
LAST-MODIFIED:20260918T152258Z
LOCATION:Chamberlin 5280
SUMMARY:Entanglement Limits on Coherent Enhancement\, Theory Seminar (
 High Energy/Cosmology)\, Zach Bogorad\, Fermilab
DESCRIPTION:Coherent enhancement is a powerful mechanism for improving
  the sensitivity of a wide range of detectors\, but its practical use 
 is often limited by the difficulty of preparing the required quantum s
 tates. In this talk\, I will show that this difficulty has a fundament
 al origin: coherent enhancement is quantitatively constrained by entan
 glement. I will present general bounds on how the strength of coherent
  effects can scale with system size\, as a function of the single-mode
  entanglement entropy of the detector. These bounds smoothly interpola
 te between the incoherent and fully coherent regimes\, and apply both 
 to parameter-estimation problems and to scattering processes. I will d
 iscuss these results from two complementary perspectives: First\, they
  appear as bounds on the quantum Fisher information of many-body state
 s\, which translate directly into limits on parameter sensitivity via 
 the quantum Cramér–Rao bound. Second\, they can be interpreted as l
 imits on a class of scattering cross sections\, leading to predictions
  for how minimum detectable interaction strengths scale with target si
 ze. Together\, these results provide a unified view of coherent enhanc
 ement in metrology and scattering experiments\, and motivate the devel
 opment of new techniques for generating entangled detector states.
URL:https://www.physics.wisc.edu/events/?id=9793
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