Coupling and entangling of quantum states in quantum dot molecules

被引:743
作者
Bayer, M [1 ]
Hawrylak, P
Hinzer, K
Fafard, S
Korkusinski, M
Wasilewski, ZR
Stern, O
Forchel, A
机构
[1] Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany
[2] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada
[3] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada
关键词
D O I
10.1126/science.291.5503.451
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We demonstrate coupling and entangling of quantum states in a pair of vertically aligned, self-assembled quantum dots by studying the emission of an interacting electron-hole pair (exciton) in a single dot molecule as a function of the separation between the dots. An interaction-induced energy splitting of the exciton is observed that exceeds 30 millielectron volts for a dot layer separation of 4 nanometers. The results are interpreted by mapping the tunneling of a particle in a double dot to the problem of a single spin. The electron-hole complex is shown to be equivalent to entangled states of two interacting spins.
引用
收藏
页码:451 / 453
页数:3
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