Direct observation of Josephson capacitance

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 d...

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Bibliographic Details
Published in:Physical review letters 2005-11, Vol.95 (20), p.206806-206806, Article 206806
Main Authors: Sillanpää, M A, Lehtinen, T, Paila, A, Makhlin, Yu, Roschier, L, Hakonen, P J
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.95.206806