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SUMMARY:Filtering noise in quantum systems - Biercuk\, M (University of Sy
 dney)
DTSTART:20140808T084500Z
DTEND:20140808T092500Z
UID:TALK53681@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Alex Soare (ARC Centre for Engineered Quantum Syst
 ems\, University of Sydney)\, Harrison Ball (ARC Centre for Engineered Qua
 ntum Systems\, University of Sydney)\, David Hayes (ARC Centre for Enginee
 red Quantum Systems\, University of Sydney)\, Xinglong Zhen (ARC Centre fo
 r Engineered Quantum Systems\, University of Sydney)\, MC Jarratt (ARC Cen
 tre for Engineered Quantum Systems\, University of Sydney)\, Jarrah Sastra
 wan (ARC Centre for Engineered Quantum Systems\, University of Sydney) \n\
 nInstabilities due to extrinsic interference are routinely faced in system
 s engineering\, and a common solution is to rely on a broad class of filte
 ring techniques in order to afford stability to intrinsically unstable sys
 tems. For instance\, electronic systems are frequently designed to incorpo
 rate electrical filters composed of\, e.g. RLC components\, in order to su
 ppress the effects of out-of-band fluctuations that interfere with desired
  performance. Quantum coherent systems are now moving to a level of comple
 xity where challenges associated with realistic time-dependent noise are c
 oming to the fore. In this talk we present work using the theory of quantu
 m control engineering and experiments with trapped ions to demonstrate the
  construction of noise filters which are specifically designed to mitigate
  the effect of realistic time-dependent fluctuations on qubits during usef
 ul operations. Starting with desired filter characteristics and the Walsh 
 basis functions\, we use a com bination of analytic design rules and numer
 ic search to construct time-domain noise filters tailored to a desired sta
 te transformation. We describe experiments validating the generalized filt
 er-transfer function framework for arbitrary quantum control operations\, 
 and demonstrate that it can be leveraged as an effective tool for developi
 ng robust control protocols. We describe how these filtering approaches ca
 n be extended to multi-qubit gates and even complex quantum control tasks 
 at the algorithmic level.\n
LOCATION:Seminar Room 1\, Newton Institute
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