Tanuwijaya Randy Stefan, Liang Hong, Xi Jiawei, Wong Wai Chun, Yung Tsz Kit, Tam Wing Yim, Li Jensen
Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China.
Nanophotonics. 2024 Feb 21;13(6):927-936. doi: 10.1515/nanoph-2023-0844. eCollection 2024 Mar.
Metasurfaces have recently opened up applications in the quantum regime, including quantum tomography and the generation of quantum entangled states. With their capability to store a vast amount of information by utilizing the various geometric degrees of freedom of nanostructures, metasurfaces are expected to be useful for processing quantum information. Here, we propose and experimentally demonstrate a programmable metasurface capable of performing quantum algorithms using both classical and quantum light with single photons. Our approach encodes multiple programmable quantum algorithms and operations, such as Grover's search algorithm and the quantum Fourier transform, onto the same metalens array on a metasurface. A spatial light modulator selectively excites different sets of metalenses to carry out the quantum algorithms, while the interference patterns captured by a single-photon camera are used to extract information about the output state at the selected output directions. Our programmable quantum metasurface approach holds promising potential as a cost-effective means of miniaturizing components for quantum computing and information processing.
超表面最近在量子领域开辟了应用，包括量子断层成像和量子纠缠态的产生。凭借利用纳米结构的各种几何自由度来存储大量信息的能力，超表面有望用于处理量子信息。在此，我们提出并通过实验证明了一种可编程超表面，它能够使用单光子的经典光和量子光来执行量子算法。我们的方法将多种可编程量子算法和操作，如格罗弗搜索算法和量子傅里叶变换，编码到超表面上的同一个超透镜阵列上。空间光调制器选择性地激发不同组的超透镜来执行量子算法，而由单光子相机捕获的干涉图案则用于提取所选输出方向上输出状态的信息。我们的可编程量子超表面方法作为一种使量子计算和信息处理组件小型化的经济有效手段，具有广阔的前景。
