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Increasing Spectroscopic Coherence Times of a DC SQUID Phase Qubit by Operating Deeper in the Potential Well

TitleIncreasing Spectroscopic Coherence Times of a DC SQUID Phase Qubit by Operating Deeper in the Potential Well
Publication TypeJournal Article
Year of Publication2007
AuthorsR. M. Lewis, S. K. Dutta, T. A. Palomaki, B. K. Cooper, A. J. Przybysz, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood
JournalIEEE Transactions on Applied Superconductivity
Volume17
Pagination101–104
Date Publishedjun
ISSN1051-8223
Keywords2007, Multiple Fellows
Abstract

We present measurements of the spectroscopic coherence time, T2* of a Nb-AlOx-Nb dc SQUID phase qubit. T2* is calculated from the spectroscopic width of the |0rang to |1rang transition measured at 25 mK. We find that T2*increases at higher transition frequencies corresponding to measurements deeper in the potential well. The measured are consistent with root mean square current noise saturating at 4 nA.

URLhttp://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4277555