Spectroscopy of energy-level splitting between two macroscopic quantum states of charge coherently superposed by Josephson coupling
Spectroscopy of energy-level splitting between two macroscopic quantum states of charge coherently superposed by Josephson coupling
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DOI：
10.1103/physrevlett.79.2328
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发表时间：
1997-09-22
影响因子：
8.6
通讯作者：
Tsai, JS
中科院分区：
文献类型：
--
作者：
Nakamura, Y;Chen, CD;Tsai, JS
研究了微波辐照下电压偏置超导单电子晶体管中的库珀对隧道效应。通过跟踪光子辅助约瑟夫森准粒子电流的峰值位置随微波频率的变化，我们观察到了准卡尔格空间中的能量色散曲线。这表明，在约瑟夫森耦合相干叠加的两个宏观电荷量子态之间发生能级分裂。
We study Cooper-pair tunneling in a voltage-biased superconducting single-electron transistor under microwave irradiation. By tracing the peak positions of a photon-assisted Josephson-quasiparticle current as a function of the microwave frequency, we observe an energy-dispersion curve in the quasicharge space. This shows that energy-level splitting occurs between two macroscopic quantum states of charge coherently superposed by Josephson coupling.