近日，北京大学杨起帆团队研究了大规模集群量子微梳。该研究于2025年4月16日发表在《光：科学与应用》杂志上。

光学频率梳包括一组等距的锁相谱线。用相关量子光取代这些经典组件，产生了簇量子频率梳，为基于测量的量子计算和多用户量子网络提供了丰富的量子资源。研究组提出并在由多频激光器驱动的片上光学微谐振器内生成团簇量子微腔。

通过共振增强的四波混频过程，确定地创建了具有60个qu模的连续可变簇态。通过调整泵浦线的配置，可以将图结构编程为一维和二维网格，基于测量的协方差矩阵，可以确认泵浦线是不可分割的。该工作展示了光子芯片中具有前所未有的原始压缩水平的最大规模簇态，为具有量子优势的计算和通信任务提供了一个紧凑且可扩展的平台。

附：英文原文

Title: Large-scale cluster quantum microcombs

Author: Wang, Ze, Li, Kangkang, Wang, Yue, Zhou, Xin, Cheng, Yinke, Jing, Boxuan, Sun, Fengxiao, Li, Jincheng, Li, Zhilin, Wu, Bingyan, Gong, Qihuang, He, Qiongyi, Li, Bei-Bei, Yang, Qi-Fan

Issue&Volume: 2025-04-16

Abstract: An optical frequency comb comprises a cluster of equally spaced, phase-locked spectral lines. Replacing these classical components with correlated quantum light gives rise to cluster quantum frequency combs, providing abundant quantum resources for measurement-based quantum computation, and multi-user quantum networks. We propose and generate cluster quantum microcombs within an on-chip optical microresonator driven by multi-frequency lasers. Through resonantly enhanced four-wave mixing processes, continuous-variable cluster states with 60 qumodes are deterministically created. The graph structures can be programmed into one- and two-dimensional lattices by adjusting the configurations of the pump lines, which are confirmed inseparable based on the measured covariance matrices. Our work demonstrates the largest-scale cluster states with unprecedented raw squeezing levels from a photonic chip, offering a compact and scalable platform for computational and communicational tasks with quantum advantages.

DOI: 10.1038/s41377-025-01812-2

Source: https://www.nature.com/articles/s41377-025-01812-2