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DTSTART:20150308T070000
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DTSTART:20151101T060000
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UID:69db054d91b13
DTSTART;TZID=America/Toronto:20151207T143000
SEQUENCE:0
TRANSP:TRANSPARENT
DTEND;TZID=America/Toronto:20151207T143000
URL:https://uwaterloo.ca/institute-for-quantum-computing/events/colloquium-
 nengkun-yu
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West 0101 Waterloo
  ON N2L 3G1 Canada
SUMMARY:Colloquium: Nengkun Yu
CLASS:PUBLIC
DESCRIPTION:SAMPLE-OPTIMAL TOMOGRAPHY OF QUANTUM STATES\n\nNENGKUN YU\, IQC
 \n\nIt is a fundamental problem to decide how many copies of an unknown\nm
 ixed quantum state are necessary and sufficient to determine the\nstate. P
 reviously\, it was known only that estimating states to error\nϵ in trace
  distance required O(dr2/ϵ2) copies for a d-dimensional\ndensity matrix o
 f rank r. Here\, we give a theoretical measurement\nscheme (POVM) that req
 uires O((dr/δ)ln(d/δ)) copies of ρ to error\nδ in infidelity\, and a m
 atching lower bound up to logarithmic\nfactors.
DTSTAMP:20260412T023701Z
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