Enhancement of macroscopic quantum tunneling by Landau-Zener transitions

被引：32

作者：

Ankerhold, J ^{[1
]}

Grabert, H ^{[1
]}

机构：

[1] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.91.016803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Motivated by recent realizations of qubits with a readout by macroscopic quantum tunneling in a Josephson junction, we study the problem of barrier penetration in the presence of coupling to a spin-1/2 system. It is shown that, when the diabatic potentials for fixed spin intersect in the barrier region, Landau-Zener transitions lead to an enhancement of the tunneling rate. The effect of these spin flips in imaginary time is in qualitative agreement with experimental observations.

引用

页数：4

共 13 条

[1] QUANTUM TUNNELLING IN A DISSIPATIVE SYSTEM [J].