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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-1148
DTSTART:20080410T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260423T010348Z
LAST-MODIFIED:20080408T182439Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum computation using tunable flux qubits\, R. G. Herb Con
 densed Matter Seminar\, Matthias Steffen\, IBM Yorktown Heights
DESCRIPTION:The quest towards building a practical quantum computer us
 ing superconducting materials and Josephson junctions has made rapid p
 rogress over the past several years. Experimental demonstrations range
 d from high fidelity single qubit gates to elementary two-qubit gates.
  One major step towards continued progress consists of understanding a
 ll major sources of decoherence that destroy the fragile quantum state
 s. In this talk we provide an overview of our experimental efforts usi
 ng superconducting qubits. Our qubit is a tunable flux qubit coupled t
 o a high quality transmission line resonator. We show quantum informat
 ion storage in the resonator with lifetimes of a few microseconds. The
  qubit itself is shown to have short coherence times\, which are not w
 ell understood at present. One possible mechanism may be due to stray 
 capacitance of the qubit to ground and bias leads. We present a simple
  model of decoherence due to the stray capacitances and speculate on f
 uture design strategies. 
URL:https://www.physics.wisc.edu/events/?id=1148
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