Quantum measurement of a mesoscopic spin ensemble

被引：72

作者：

Giedke, G.

Taylor, J. M.

D'Alessandro, D.

Lukin, M. D.

Imamoglu, A.

机构：

[1] ETH, Inst Quantenelekt, CH-8093 Zurich, Switzerland

[2] Max Planck Inst Quanten Opt, D-85748 Garching, Germany

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] Iowa State Univ, Dept Math, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW A | 2006年 / 74卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevA.74.032316

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We describe a method for precise estimation of the polarization of a mesoscopic spin ensemble by using its coupling to a single two-level system. Our approach requires a minimal number of measurements on the two-level system for a given measurement precision. We consider the application of this method to the case of nuclear-spin ensemble defined by a single electron-charged quantum dot: we show that decreasing the electron spin dephasing due to nuclei and increasing the fidelity of nuclear-spin-based quantum memory could be within the reach of present day experiments.

引用

页数：8

共 45 条

[1] Dynamical description of quantum computing: Generic nonlocality of quantum noise [J].