近日，中国科学技术大学的李传锋&韩永建及其研究团队取得一项新进展。经过不懈努力，他们实现类冯-诺伊曼光子处理器及其在混沌量子特征研究中的应用。相关研究成果已于2024年3月14日在国际知名学术期刊《光：科学与应用》上发表。

本文提出了一种基于时间模式编码和光学平台上循环结构的类冯-诺伊曼架构，该架构具有多模式通用可编程性、资源效率、相位稳定性和软件可扩展性。为了说明这些优点，研究人员在同一处理器上执行两个不同的程序，在不同的资源需求下，从两个方面研究混沌的量子特征:在相空间中表现出的特征行为(13种模式)和以前没有实验定量研究的费米黄金法则(26种模式)。最大程序包含一个1694个相位可自由调节的光学干涉仪网络。考虑到当前最先进的技术，这一体系结构是现实世界应用程序中最有前途的候选者。

据悉，光子量子计算具有独特的优势和重要的作用。在Knill-Laflamme-Milburn完成里程碑式的工作20年后，各种光子处理器的 looped structure on table被提出，量子优于经典计算机的优势也被证明。现在正是将这项技术应用于实际应用的好时机。然而，在目前的技术水平上，这一目标受到现有处理器体系结构的体光学器件的可编程性或集成光学器件损耗的限制，因此资源成本也是一个问题。

附：英文原文

Title: A von-Neumann-like photonic processor and its application in studying quantum signature of chaos

Author: Yu, Shang, Liu, Wei, Tao, Si-Jing, Li, Zhi-Peng, Wang, Yi-Tao, Zhong, Zhi-Peng, Patel, Raj B., Meng, Yu, Yang, Yuan-Ze, Wang, Zhao-An, Guo, Nai-Jie, Zeng, Xiao-Dong, Chen, Zhe, Xu, Liang, Zhang, Ning, Liu, Xiao, Yang, Mu, Zhang, Wen-Hao, Zhou, Zong-Quan, Xu, Jin-Shi, Tang, Jian-Shun, Han, Yong-Jian, Li, Chuan-Feng, Guo, Guang-Can

Issue&Volume: 2024-03-14

Abstract: Photonic quantum computation plays an important role and offers unique advantages. Two decades after the milestone work of Knill-Laflamme-Milburn, various architectures of photonic processors have been proposed, and quantum advantage over classical computers has also been demonstrated. It is now the opportune time to apply this technology to real-world applications. However, at current technology level, this aim is restricted by either programmability in bulk optics or loss in integrated optics for the existing architectures of processors, for which the resource cost is also a problem. Here we present a von-Neumann-like architecture based on temporal-mode encoding and looped structure on table, which is capable of multimode-universal programmability, resource-efficiency, phase-stability and software-scalability. In order to illustrate these merits, we execute two different programs with varying resource requirements on the same processor, to investigate quantum signature of chaos from two aspects: the signature behaviors exhibited in phase space (13 modes), and the Fermi golden rule which has not been experimentally studied in quantitative way before (26 modes). The maximal program contains an optical interferometer network with 1694 freely-adjustable phases. Considering current state-of-the-art, our architecture stands as the most promising candidate for real-world applications.

DOI: 10.1038/s41377-024-01413-5

Source: https://www.nature.com/articles/s41377-024-01413-5