Spin-resolved quantum-dot resonance fluorescence
Spin-resolved quantum-dot resonance fluorescence
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DOI：
10.1038/nphys1182
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发表时间：
2009-03-01
期刊：
影响因子：
19.6
通讯作者：
Atatuere, Mete
中科院分区：
文献类型：
--
作者：
Vamivakas, A. Nick;Zhao, Yong;Atatuere, Mete
自组装半导体量子点中的受限自旋有望作为研究固态介观物理的探针和量子信息科学的固定量子位（1 - 7）。此外，自组装量子点的激发可以与近红外光子相互作用，在静止和“飞行”量子位之间提供界面。在这里，我们报告的自旋选择性光子发射的共振驱动量子点跃迁的观察。散射光子光谱中的Mollow三重态（8）--当光学跃迁被共振驱动时共振荧光的标志--被呈现为从原始驱动场光谱隔离感兴趣的光子的自然方式。我们还证明了两个自旋标记的光子态的相对频率可以通过自旋选择动态斯塔克效应独立于外加磁场进行调谐，由相同的驱动激光引起。这一演示应该是朝着实现具有挑战性的任务迈出的一步，这些任务包括电子自旋读出、线性光学量子计算的单光子产生和自旋光子纠缠。
Confined spins in self-assembled semiconductor quantum dots promise to serve both as probes for studying mesoscopic physics in the solid state and as stationary qubits for quantum-information science(1-7). Moreover, the excitations of self-assembled quantum dots can interact with near-infrared photons, providing an interface between stationary and 'flying' qubits. Here, we report the observation of spin-selective photon emission from a resonantly driven quantum-dot transition. The Mollow triplet(8) in the scattered photon spectrum-the hallmark of resonance fluorescence when an optical transition is driven resonantly-is presented as a natural way to spectrally isolate the photons of interest from the original driving field. We also demonstrate that the relative frequencies of the two spin-tagged photon states can be tuned independent of an applied magnetic field through the spin-selective dynamic Stark effect, induced by the same driving laser. This demonstration should be a step towards the realization of challenging tasks such as electron-spin readout, heralded single-photon generation for linear-optics quantum computing and spin-photon entanglement.