Sillanpää M A, Lehtinen T, Paila A, Makhlin Yu, Roschier L, Hakonen P J
Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland.
Phys Rev Lett. 2005 Nov 11;95(20):206806. doi: 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 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.
已在分裂库珀对盒（CPB）的相位门偏置平面上测量了有效电容。我们的低频电抗测量方案使我们能够纯粹探测由于CPB能带结构引起的电容敏感性。使用通过光谱手段独立确定的参数对数据进行了定量解释。此外，我们在实践中表明，该方法提供了一种对CPB量子态进行非破坏读出的有效方式。
