Direct observation of Josephson capacitance

M. A. Sillanpää, T. Lehtinen, A. Paila, Yu. Makhlin, L. Roschier, P. J. Hakonen

Research output: Contribution to journalArticleScientificpeer-review

87 Citations (Scopus)
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The effective capacitance has been measured in the split Cooper-pair box (CPB) over its phase-gate bias plane. Our low-frequency reactive measurement scheme allows us to probe purely the capacitive susceptibility due to the CPB band structure. The data are quantitatively explained using parameters determined independently by spectroscopic means. In addition, we show in practice that the method offers an efficient way to do nondemolition readout of the CPB quantum state.
Original languageEnglish
Article number206806
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed


  • Josephson capacitance, Cooper-pair box, Josephson junction


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