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DTSTART:20151101T060000
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DTSTART;TZID=America/Toronto:20151207T143000
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URL:/institute-for-quantum-computing/events/colloquium-
 nengkun-yu
SUMMARY:Colloquium: Nengkun Yu
CLASS:PUBLIC
DESCRIPTION:Summary \n\nSAMPLE-OPTIMAL TOMOGRAPHY OF QUANTUM STATES\n\nNENG
 KUN YU\, IQC\n\nIt is a fundamental problem to decide how many copies of a
 n unknown\nmixed quantum state are necessary and sufficient to determine t
 he\nstate. Previously\, it was known only that estimating states to error\
 nϵ in trace distance required O(dr2/ϵ2) copies for a d-dimensional\ndens
 ity matrix of rank r. Here\, we give a theoretical measurement\nscheme (PO
 VM) that requires O((dr/δ)ln(d/δ)) copies of ρ to error\nδ in infideli
 ty\, and a matching lower bound up to logarithmic\nfactors.\n 
DTSTAMP:20250529T063518Z
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