Multiphoton transitions between energy levels in a current-biased Josephson tunnel junction

被引：95

作者：

Wallraff, A ^{[1
]}

Duty, T ^{[1
]}

Lukashenko, A ^{[1
]}

Ustinov, AV ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Inst Phys 3, D-91058 Erlangen, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.90.037003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The escape of a current-biased Josephson tunnel junction from the zero-voltage state in the presence of weak microwave radiation is investigated experimentally at low temperatures. The measurements of the junction switching current distribution indicate the macroscopic quantum tunneling of the phase below a crossover temperature of T-star approximate to 280 mK. At temperatures below T-star we observe both single-photon and multiphoton transitions between the junction energy levels by applying microwave radiation in the frequency range between 10 and 38 GHz to the junction. These observations reflect the anharmonicity of the junction potential containing only a small number of levels.

引用

页数：4

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