Dynamics and decoherence in the central spin model using exact methods

被引：49

作者：

Bortz, Michael ^{[1
,2
,3
]}

Eggert, Sebastian ^{[1
,2
]}

Schneider, Christian ^{[4
]}

Stuebner, Robert ^{[5
]}

Stolze, Joachim ^{[5
]}

机构：

[1] Tech Univ Kaiserslautern, Dept Phys, D-67663 Kaiserslautern, Germany

[2] Tech Univ Kaiserslautern, Res Ctr OPTIMAS, D-67663 Kaiserslautern, Germany

[3] Fraunhofer ITWM, D-67663 Kaiserslautern, Germany

[4] ETH Honggerberg, HIF E12, IfB, CH-8093 Zurich, Switzerland

[5] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 16期

关键词：

QUANTUM-DOT; ELECTRON-SPIN; NUCLEI; RELAXATION; BATH;

D O I：

10.1103/PhysRevB.82.161308

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dynamics and decoherence of an electronic spin-1/2 qubit coupled to a bath of nuclear spins via hyperfine interactions in a quantum dot is studied. We show how exact results from the integrable solution can be used to understand the dynamic behavior of the qubit. It is possible to predict the main frequency contributions and their broadening for relatively general initial states analytically, leading to an estimate of the corresponding decay times, which are related to T(1) of the electron. Furthermore, for a small bath polarization, a distinct low-frequency time scale is observed.

引用

页数：4

共 25 条

[1] Numerical modeling of the central spin problem using the spin-coherent-state P representation [J].