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.
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页数：4
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