A coherent two-level system in a superconducting single-electron transistor observed through photon-assisted cooper-pair tunneling

被引：10

作者：

Nakamura, Y ^{[1
]}

Tsai, JS ^{[1
]}

机构：

[1] NEC Fundamental Res Labs, Tsukuba, Ibaraki 3058501, Japan

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1999年 / 12卷 / 06期

关键词：

energy-level splitting; photon-assisted Cooper-pair tunneling; superconducting single-electron box; superconducting single-electron transistor;

D O I：

10.1023/A:1007793228293

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A coherent two-level system can be constructed in an ultrasmall Josephson-junction circuit, where two charge states are coupled by single Cooper-pair tunneling. To investigate coherence and decoherence in the two-level system, we have measured de current through a voltage-biased superconducting single-electron transistor. Under microwave irradiation, a current due to photon-assisted Cooper-pair tunneling is induced, which serves as a useful experimental tool for spectroscopic study of the energy levels in the two-level system. We observed energy-level splitting, which is evidence of the coherent superposition of the two charge states.

引用

页码：799 / 806

页数：8

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