Nonlocal Nuclear Spin Quieting in Quantum Dot Molecules: Optically Induced Extended Two-Electron Spin Coherence Time

被引：15

作者：

Chow, Colin M. ^{[1
,2
]}

Ross, Aaron M. ^{[1
]}

Kim, Danny ^{[3
,5
]}

Gammon, Daniel ^{[3
]}

Bracker, Allan S. ^{[3
]}

Sham, L. J. ^{[4
]}

Steel, Duncan G. ^{[1
,2
]}

机构：

[1] Univ Michigan, HM Randall Lab Phys, Ann Arbor, MI 48104 USA

[2] Univ Michigan, Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA

[3] Naval Res Lab, Washington, DC 20375 USA

[4] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[5] HRL Labs LLC, 3011 Malibu Canyon Rd, Malibu, CA 90265 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 07期

基金：

美国国家科学基金会;

关键词：

ENTANGLEMENT;

D O I：

10.1103/PhysRevLett.117.077403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate the extension of coherence between all four two-electron spin ground states of an InAs quantum dot molecule (QDM) via nonlocal suppression of nuclear spin fluctuations in two vertically stacked quantum dots (QDs), while optically addressing only the top QD transitions. Long coherence times are revealed through dark-state spectroscopy as resulting from nuclear spin locking mediated by the exchange interaction between the QDs. Line shape analysis provides the first measurement of the quieting of the Overhauser field distribution correlating with reduced nuclear spin fluctuations.

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页数：5

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