Direct Observation of Josephson Capacitance

Details Direct Observation of Josephson Capacitance Direct Observation of Josephson Capacitance

2005-04-20

arxiv.org/abs/cond-mat/0504517v2

Phys. Rev. Lett. 95, 206806 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.95.206806

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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