Instituto de Ciencia de Materiales de Madrid
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Characterization of qubit dephasing by Landau-Zener-Stückelberg-Majorana interferometry

Florian Forster, Gunnar Petersen, Stephan Manus, Peter Hänggi, Dieter Schuh, Werner Wegscheider, Sigmund Kohler, and Stefan Ludwig
Phys. Rev. Lett. 112, 116803 (2014)

Controlling coherent interaction at avoided crossings and the dynamics there is at the heart of quantum information processing. A particularly intriguing dynamics is observed in the Landau-Zener regime, where periodic passages through the avoided crossing result in an interference pattern carrying information about qubit properties. In this letter we demonstrate a straightforward method, based on steady state experiments, to obtain all relevant information about a qubit, including complex environmental influences. We use a two-electron charge qubit defined in a lateral double quantum dot as test system and demonstrate a long coherence time of T2=200ns which is limited by electron-phonon interaction.
arXiv:1309.5907 [cond-mat]

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last modified: 7.11.2017 by Sigmund Kohler