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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1698
DTSTART:20100318T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T162210Z
LAST-MODIFIED:20100303T151622Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum Information Science with Trapped Ca<sup>+</sup> Ions\,
  R. G. Herb Condensed Matter Seminar\, Rainer Blatt\, Universitat Inns
 bruck
DESCRIPTION:Trapped strings of cold ions provide an ideal system for q
 uantum information processing. The quantum information can be stored i
 n individual ions and these qubits can be individually prepared\; the 
 corresponding quantum states can be manipulated and measured with near
 ly 100% detection efficiency. With a small ion-trap quantum computer b
 ased on up to eight trapped Ca<sup>+</sup> ions as qubits we have gene
 rated genuine quantum states in a pre-programmed way. In particular\, 
 we have generated GHZ and W states in a fast and scalable way and we h
 ave demonstrated for the first time a Toffoli gate with trapped ions w
 hich is analyzed via state and process tomography. High fidelity CNOT-
 gate operations are investigated towards fault-tolerant quantum comput
 ing and using logical qubits encoded in decoherence-free subspaces\, a
  universal set of gate operations was implemented and analyzed. As app
 lications of quantum information processing\, an experimental state-in
 dependent test of quantum contextuality was performed\, a simulation o
 f the Dirac equation was implemented and a quantum walk with a trapped
  ion was realized.
\n
\nThis work is supported by the Austrian Science
  Fund (FWF)\, by the European Commission (CONQUEST\, SCALA) and in par
 ts by IARPA.
URL:https://www.physics.wisc.edu/events/?id=1698
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