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DTSTART:20181104T020000
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UID:calendar.17282.field_event_date_2.0@physics.wustl.edu
CREATED:20181115T173551Z
DESCRIPTION:How violently do two quantum operators disagree? Different subf
ields of physics feature different notions of incompatibility: (i) In quan
tum information theory\, uncertainty relations are cast in terms of entrop
ies. These entropic uncertainty relations constrain measurement outcomes.
(ii) Condensed matter and high-energy physics feature interacting quantum
many-body systems\, such as spin chains. A local perturbation\, such as a
Pauli operator on one side of a chain\, spreads through many-body entangle
ment. The perturbation comes to overlap\, and to disagree\, with probes lo
calized on the opposite side of the system. This disagreement signals that
quantum information about the perturbation has scrambled\, or become hidd
en in highly nonlocal correlations. I will unite these two notions of quan
tum operator disagreement\, presenting an entropic uncertainty relation fo
r quantum-information scrambling. The entropies are of distributions over
weak and strong measurements’ possible outcomes. The uncertainty bound str
engthens when a spin chain scrambles in numerical simulations. Hence the s
ubfields—\n quantum information\, condensed matter\, and high-energy physic
s—can agree about when quantum operations disagree. Our relation can be te
sted experimentally with superconducting qubits\, trapped ions\, and quant
um dots.\n\nNYH\, Bartolotta\, and Pollack\, arXiv:1806.04147 (2018).
DTSTART;TZID=America/Chicago:20181210T160000
DTEND;TZID=America/Chicago:20181210T160000
LAST-MODIFIED:20181115T182603Z
LOCATION:38.649462\, -90.305046
SUMMARY:Reconciling two notions of quantum operator disagreement: Uncertain
ty relations and information scrambling
URL;TYPE=URI:https://physics.wustl.edu/events/reconciling-two-notions-quant
um-operator-disagreement-uncertainty-relations-and-information
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