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SUMMARY:A General Filter-Function Approach to Noise Filtering in Open-Loop
  Quantum Control - Viola\, L (Dartmouth College)
DTSTART:20140805T131500Z
DTEND:20140805T135500Z
UID:TALK53610@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Hamiltonian engineering via open-loop quantum control provides
  a versatile and experimentally validated framework for precisely manipula
 ting a broad class of non-Markovian dynamical evolutions of interest\, wit
 h applications ranging from dynamical decoupling and dynamically corrected
  quantum gates to noise spectroscopy and quantum simulation. In this conte
 xt\, transfer-function techniques directly motivated by control engineerin
 g have proved invaluable for obtaining a transparent picture of the contro
 lled dynamics in the frequency domain and for quantitatively analyzing con
 trol performance. In this talk\, I will show how to construct a general fi
 lter-function approach\, which overcomes the limitations of the existing f
 ormalism. The key insight is to identify a set of "fundamental filter func
 tions"\, whose knowledge suffices to construct arbitrary filter functions 
 in principle and to determine the minimum "filtering order" that a given c
 ontrol protocol can guar antee. Implications for dynamical control in mult
 i-qubit systems and/or in the presence of non-Gaussian noise will be discu
 ssed.\n
LOCATION:Seminar Room 1\, Newton Institute
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