| 报告题目 | Optical manipulation of the electron and nuclear spin in GaAs quantum dots |
| 报告人 | Prof. X. Marie |
| 报告人单位 | Universite de Toulouse, FRANCE |
| 报告时间 | 2013-05-28 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | 报告摘要：
In recent years, the interest in studying quantum-dot nuclear spin systems and their coupling to confined electron spins has been further fueled by its importance for possible quantum information processing applications. The fascinating nonlinear (quantum) dynamics of the coupled electron-nuclear spin system is universal in quantum dot optics and transport. In the first part of this talk, experimental work performed over the last decade in studying this mesoscopic, coupled electronuclear spin system is reviewed, with special focus on how optical addressing of electron spins can be exploited to manipulate and read out the quantum-dot nuclei. The second part of the talk will be devoted to the generation of entangled photon pairs. We create a naturally symmetric quantum dot cascade that emits highly polarization entangled photon pairs on demand. The emitted photons strongly violate Bell¡¯s inequality. The source consists of strain-free GaAs dots grown by Droplet Epitaxy on a triangular symmetric (111)A surface [1]. The remaining decoherence channel of the photon source is ascribed to random charge and nuclear spin fluctuations in and near the dot. We discuss the practical consequences of the nonlinear (quantum) dynamics of the coupled electron-nuclear spin system revealed in quantum dot optics [2] in these nano-objects with trigonal (C3v) symmetry [3]. [1] T. Kuroda et al, arxiv 1302.6389 [2] B. Urbaszek, X. Marie, T. Amand, O. Krebs, P. Voisin, P. Maletinksy, A. H?gele, A. Iamoglu, Rev. Mod. Phys. 85, 79 (2013) [3] G. Sallen, et al, Phys. Rev. Lett. 107, 166604 (2011)?; M.?Durnev et al, Phys.Rev.B 87, 085315 (2013). |
