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SUMMARY:Characterization of Qubit Dephasing by Landau-Zener Interferometry
 ’ - Prof. Stefan Ludwig\, Ludwig-Maximilians-Universität\, Munich
DTSTART:20131104T141500Z
DTEND:20131104T151500Z
UID:TALK48253@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Controlling coherent interaction at avoided crossings is at th
 e heart of quantum information processing. The most common qubit character
 ization techniques are also the technologically most demanding as they inv
 olve very quick pulse sequences. Here\, we present an alternative based on
  straightforward steady state experiments and periodic Landau-Zener transi
 tions. We demonstrate that Landau-Zener-Stückelberg-Majorana interferomet
 ry is a viable and very general tool to not only study qubit properties bu
 t\, beyond\, to decipher decoherence caused by complex environmental influ
 ences. The coherence time of our GaAs-based two-electron charge qubit is l
 imited by electron-phonon interaction. It is much longer than previously r
 eported for similar structures.\nRelated publication: arXiv:1309.5907\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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