Ultrafast Optical Spin Echo for Electron Spins in Semiconductors

被引：58

作者：

Clark, Susan M. ^{[1
]}

Fu, Kai-Mei C. ^{[2
]}

Zhang, Qiang ^{[1
,3
]}

Ladd, Thaddeus D. ^{[1
,3
]}

Stanley, Colin ^{[4
]}

Yamamoto, Yoshihisa ^{[1
,3
]}

机构：

[1] Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA

[2] Hewlett Packard Labs, Palo Alto, CA 94304 USA

[3] Res Org Informat & Syst, Natl Inst Informat, Chiyoda Ku, Tokyo 1018430, Japan

[4] Univ Glasgow, Dept Elect & Elect Engn, Glasgow G12 8LT, Lanark, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 24期

关键词：

QUANTUM DOTS; MANIPULATION; PULSES; GAAS;

D O I：

10.1103/PhysRevLett.102.247601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time T(2) of a spin system. We report on the experimental implementation of all-optical spin echo to determine the T(2) time of a semiconductor electron-spin system. We use three ultrafast optical pulses to rotate spins an arbitrary angle and measure an echo signal as the time between pulses is lengthened. Unlike previous spin-echo techniques using microwaves, ultrafast optical pulses allow clean T(2) measurements of systems with dephasing times (T(2)(*)) fast in comparison to the time scale for microwave control. This demonstration provides a step toward ultrafast optical dynamic decoupling of spin-based qubits.

引用

页数：4