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Direct Observation of Josephson Capacitance

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arxiv cond-mat/0504517 v2 pith:3IUN5CWH submitted 2005-04-20 cond-mat.mes-hall cond-mat.supr-con

Direct Observation of Josephson Capacitance

M. A. Sillanpaa , T. Lehtinen , A. Paila , Yu. Makhlin , L. Roschier , P. J. Hakonen This is my paper
classification cond-mat.mes-hall cond-mat.supr-con
keywords capacitanceadditionallowsbandbeenbiascapacitivecooper
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 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 non-demolition readout of the CPB quantum state.

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