Liu Xujing, Kan Yinhui, Kumar Shailesh, Kulikova Liudmilla F, Davydov Valery A, Agafonov Viatcheslav N, Zhao Changying, Bozhevolnyi Sergey I
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China.
Center for Nano Optics, University of Southern Denmark, Odense M, DK-5230, Denmark.
Adv Mater. 2024 Jan;36(4):e2304495. doi: 10.1002/adma.202304495. Epub 2023 Dec 3.
Ultracompact chip-integrated single-photon sources of collimated beams with polarization-encoded states are crucial for integrated quantum technologies. However, most of currently available single-photon sources rely on external bulky optical components to shape the polarization and phase front of emitted photon beams. Efficient integration of quantum emitters with beam shaping and polarization encoding functionalities remains so far elusive. Here, ultracompact single-photon sources of linearly polarized vortex beams based on chip-integrated quantum emitter-coupled metasurfaces are presented, which are meticulously designed by fully exploiting the potential of nanobrick-arrayed metasurfaces. The authors first demonstrate on-chip single-photon generation of high-purity linearly polarized vortex beams with prescribed topological charges of 0, - 1, and +1. The multiplexing of single-photon emission channels with orthogonal linear polarizations carrying different topological charges are further realized and their entanglement is demonstarated. The work illustrates the potential and feasibility of ultracompact quantum emitter-coupled metasurfaces as a new quantum optics platform for realizing chip-integrated high-dimensional single-photon sources.
具有偏振编码态的准直光束的超紧凑型芯片集成单光子源对于集成量子技术至关重要。然而，目前大多数可用的单光子源都依赖外部庞大的光学组件来塑造发射光子束的偏振和相位前沿。到目前为止，量子发射器与光束整形和偏振编码功能的高效集成仍然难以实现。在此，提出了基于芯片集成量子发射器耦合超表面的线性偏振涡旋光束超紧凑型单光子源，其通过充分利用纳米砖阵列超表面的潜力进行精心设计。作者首先展示了具有规定拓扑电荷0、-1和+1的高纯度线性偏振涡旋光束的片上单光子产生。进一步实现了携带不同拓扑电荷的正交线性偏振的单光子发射通道的复用，并证明了它们的纠缠。这项工作说明了超紧凑型量子发射器耦合超表面作为实现芯片集成高维单光子源的新型量子光学平台的潜力和可行性。
