Gao Ya-Jun, Wang Zheng, Jiang Yue, Peng Ru-Wen, Wang Zi-Yu, Qi Dong-Xiang, Fan Ren-Hao, Tang Wen-Jie, Wang Mu
National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
American Physical Society, Ridge, New York 11961, USA.
Phys Rev Lett. 2022 Jul 8;129(2):023601. doi: 10.1103/PhysRevLett.129.023601.
Photonic quantum information processing relies on operating the quantum state of photons, which usually involves bulky optical components unfavorable for system miniaturization and integration. Here, we report on the transformation and distribution of polarization-entangled photon pairs with multichannel dielectric metasurfaces. The entangled photon pairs interact with metasurface building blocks, where the geometrical-scaling-induced phase gradients are imposed, and are transformed into two-photon entangled states with the desired polarization. Two metasurfaces, each simultaneously distributing polarization-entangled photons to spatially separated multiple channels M (N), may accomplish M×N channels of entanglement distribution and transformation. Experimentally we demonstrate 2×2 and 4×4 distributed entanglement states, including Bell states and superposition of Bell states, with high fidelity and strong polarization correlation. We expect this approach paves the way for future integration of quantum information networks.
光子量子信息处理依赖于操纵光子的量子态，这通常涉及到体积庞大的光学元件，不利于系统的小型化和集成。在此，我们报告了利用多通道介质超表面对偏振纠缠光子对进行变换和分发的情况。纠缠光子对与超表面构建块相互作用，在构建块中施加几何尺度诱导的相位梯度，并被变换为具有所需偏振的双光子纠缠态。两个超表面，每个都能同时将偏振纠缠光子分发到空间上分离的多个通道M（N），可以实现M×N通道的纠缠分发和变换。我们通过实验展示了2×2和4×4的分布式纠缠态，包括贝尔态和贝尔态的叠加，具有高保真度和强偏振相关性。我们期望这种方法为未来量子信息网络的集成铺平道路。
