Phys. Rev. Lett. 95, 206806 (2005) [4 pages]Direct Observation of Josephson CapacitanceReceived 20 April 2005; published 11 November 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.206806
DOI:
10.1103/PhysRevLett.95.206806
PACS:
85.25.Cp, 85.35.Gv
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