单电荷量子点中电子自旋相干的锁模

Mode locking of electron spin coherences in singly charged quantum dots.

作者信息

Greilich A, Yakovlev D R, Shabaev A, Efros Al L, Yugova I A, Oulton R, Stavarache V, Reuter D, Wieck A, Bayer M

机构信息

Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany.

出版信息

Science. 2006 Jul 21;313(5785):341-5. doi: 10.1126/science.1128215.

DOI:10.1126/science.1128215

PMID:16857937

Abstract

The fast dephasing of electron spins in an ensemble of quantum dots is detrimental for applications in quantum information processing. We show here that dephasing can be overcome by using a periodic train of light pulses to synchronize the phases of the precessing spins, and we demonstrate this effect in an ensemble of singly charged (In,Ga)As/GaAs quantum dots. This mode locking leads to constructive interference of contributions to Faraday rotation and presents potential applications based on robust quantum coherence within an ensemble of dots.

摘要

量子点系综中电子自旋的快速退相不利于量子信息处理中的应用。我们在此表明，通过使用周期性光脉冲序列来同步进动自旋的相位，可以克服退相，并且我们在单电荷（铟，镓）砷/砷化镓量子点系综中演示了这种效应。这种锁模导致对法拉第旋转贡献的相长干涉，并展现了基于点系综内稳健量子相干的潜在应用。