Quantum Phase Diffusion in a Small Underdamped Josephson Junction

被引：41

作者：

Yu, H. F. ^{[1
]}

Zhu, X. B. ^{[1
]}

Peng, Z. H. ^{[1
]}

Tian, Ye ^{[1
]}

Cui, D. J. ^{[1
]}

Chen, G. H. ^{[1
]}

Zheng, D. N. ^{[1
]}

Jing, X. N. ^{[1
]}

Lu, Li ^{[1
]}

Zhao, S. P. ^{[1
]}

Han, Siyuan ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 06期

关键词：

DISSIPATION;

D O I：

10.1103/PhysRevLett.107.067004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum phase diffusion in a small underdamped Nb/AlOx/Nb junction (similar to 0.4 mu m(2)) is demonstrated in a wide temperature range of 25-140 mK where macroscopic quantum tunneling (MQT) is the dominant escape mechanism. We propose a two-step transition model to describe the switching process in which the escape rate out of the potential well and the transition rate from phase diffusion to the running state are considered. The transition rate extracted from the experimental switching current distribution follows the predicted Arrhenius law in the thermal regime but is greatly enhanced when MQT becomes dominant.

引用

页数：5

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