• DocumentCode
    1068160
  • Title

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

  • Author

    Lewis, R.M. ; Dutta, S.K. ; Paik, Hanhee ; Palomaki, T.A. ; Cooper, B.K. ; Przybysz, A.J. ; Dragt, A.J. ; Anderson, J.R. ; Lobb, C.J. ; Wellstood, F.C.

  • Author_Institution
    Maryland Univ., College Park
  • Volume
    17
  • Issue
    2
  • fYear
    2007
  • fDate
    6/1/2007 12:00:00 AM
  • Firstpage
    101
  • Lastpage
    104
  • 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.
  • Keywords
    Josephson effect; SQUIDs; quantum computing; dc SQUID phase qubit; root mean square current noise; spectroscopic coherence time; transition frequency; Capacitance; Critical current; Energy states; Fluctuations; Inductance; Josephson junctions; Phase measurement; Potential well; SQUIDs; Spectroscopy; Decoherence; Josephson junction; noise; phase qubit;
  • fLanguage
    English
  • Journal_Title
    Applied Superconductivity, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1051-8223
  • Type

    jour

  • DOI
    10.1109/TASC.2007.897732
  • Filename
    4277555
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1068160