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SUMMARY:Robin Blume-Kohout (Sandia National Laboratories\, Albuquerque\, N
 ew Mexico)
DTSTART:20200612T000000Z
DTEND:20200612T003000Z
DTSTAMP:20260423T010132Z
UID:UTSQSI/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/UTSQSI/5/">U
 nderstanding crosstalk in quantum processors</a>\nby Robin Blume-Kohout (S
 andia National Laboratories\, Albuquerque\, New Mexico) as part of Centre 
 for Quantum Software and Information Seminar Series\n\n\nAbstract\nModel-b
 ased quantum tomography protocols like gate set tomography optimize a nois
 e model with some number of parameters in order to fit experimental data. 
  As the number of qubits increases\, two issues emerge: 1) the number of m
 odel parameters grows\, and 2) the cost of propagating quantum states (den
 sity matrices) increases exponentially.   The first issue can be addressed
  by considering reduced models that limit errors to being low-weight and g
 eometrically local. \n\nIn this talk\, we focus on the second issue and pr
 esent a method for performing approximate density matrix propagation based
  on perturbative expansions of error generators.  The method is tailored t
 o the likelihood optimization problem faced by model-based tomography prot
 ocols.  We will discuss the advantages and drawbacks of using this method 
 when characterizing the errors in up to 8-qubit systems.\n\nHosted by A/Pr
 of Chris Ferrie\, UTS Centre for Quantum Software and Information.  \n\nPl
 ease note\, Erik Nielsen's seminar will follow directly after Robin Blume-
 Kohout's seminar.\n
LOCATION:https://researchseminars.org/talk/UTSQSI/5/
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