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 to probe purely the capacitive susceptibility due to the CPB band structure. The data are quantitatively explained using parameters dete...

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Bibliographic Details
Published in:arXiv.org 2006-01
Main Authors: Sillanpaa, M A, Lehtinen, T, Paila, A, Yu Makhlin, Roschier, L, Hakonen, P J
Format: Article
Language:English
Subjects:
Capacitance
Demolition
Quantum theory
Online Access:Get full text
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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 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.
ISSN:2331-8422
DOI:10.48550/arxiv.0504517