Bao Yanjun, Lin Qiaoling, Su Rongbin, Zhou Zhang-Kai, Song Jindong, Li Juntao, Wang Xue-Hua
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
Center for Opto-Electronic Materials and Devices Research, Post-Si Semiconductor Institute, Korea Institute of Science and Technology, Seoul 02-791, South Korea.
Sci Adv. 2020 Jul 29;6(31):eaba8761. doi: 10.1126/sciadv.aba8761. eCollection 2020 Jul.
The semiconductor quantum dot (QD) has been successfully demonstrated as a potentially scalable and on-chip integration technology to generate the triggered photon streams that have many important applications in quantum information science. However, the randomicity of these photon streams emitted from the QD seriously compromises its use and especially hinders the on-demand manipulation of the spin states. Here, by accurately integrating a QD and its mirror image onto the two foci of a bifocal metalens, we demonstrate the on-demand generation and separation of the spin states of the emitted single photons. The photon streams with different spin states emitted from the QD can be flexibly manipulated to propagate along arbitrarily designed directions with high collimation of the smallest measured beaming divergence angle of 3.17°. Our work presents an effectively integrated quantum method for the simultaneously on-demand manipulation of the polarization, propagation, and collimation of the emitted photon streams.
半导体量子点（QD）已被成功证明是一种具有潜在可扩展性和片上集成性的技术，可用于产生触发光子流，这些光子流在量子信息科学中有许多重要应用。然而，量子点发射的这些光子流的随机性严重影响了其应用，尤其阻碍了对自旋态的按需操纵。在此，通过将一个量子点及其镜像精确集成到双焦点超颖透镜的两个焦点上，我们展示了发射单光子自旋态的按需生成和分离。从量子点发射的具有不同自旋态的光子流可以被灵活操纵，以沿着任意设计的方向传播，最小测量光束发散角为3.17°，具有高度准直性。我们的工作提出了一种有效的集成量子方法，用于同时按需操纵发射光子流的偏振、传播和准直。
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