Bayer M, Hawrylak P, Hinzer K, Fafard S, Korkusinski M, Wasilewski Z R, Stern O, Forchel A
Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
Science. 2001 Jan 19;291(5503):451-3. doi: 10.1126/science.291.5503.451.
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.
通过研究单个量子点分子中相互作用的电子-空穴对（激子）的发射随量子点间距离的变化，我们展示了一对垂直排列的自组装量子点中量子态的耦合和纠缠。观察到激子的相互作用诱导能隙，对于4纳米的量子点层间距，该能隙超过30毫电子伏特。通过将双量子点中粒子的隧穿映射到单自旋问题来解释这些结果。电子-空穴复合体被证明等同于两个相互作用自旋的纠缠态。
