QST-Distributed quantum computing based on Rydberg atoms 基于里德堡原子的分布式量子计算
Highly excited Rydberg atoms exhibit strong and long-range interactions, opening new possibilities for scalable quantum information processing. In terms of qubits control, Rydberg atom array is highly programmable and capable of achieving high-fidelity quantum operations, making it an excellent platform for building large-scale quantum computers. Moreover, the interactions between Rydberg atoms provide a new avenue for deterministic control of photonic quantum states. Combining the emerging technologies of Rydberg atomic arrays and Rydberg quantum photonics, we are working on distributed quantum computing based on Rydberg atoms. We plan to use Rydberg single-atom arrays to realize high-fidelity local quantum computing modules and connecting these modules through Rydberg quantum photonics techniques. In this talk, I will present our recent progress along this direction. We have demonstrated defect-free, programmable two-dimensional arrays of hundreds of atoms, efficient manipulation of Rydberg states, and high-fidelity Rydberg quantum entanglement. Furthermore, we have achieved on-demand generation of near-optimal Rydberg single photons, with purity and indistinguishability both exceeding 99.9%, realizing quantum photonic logic gates with 99.8% fidelity. We also implemented Rydberg quantum entanglement filters, extracting high-fidelity quantum entanglement from input states with extremely low fidelity.
高激发态的里德堡原子具有强且远程的相互作用，为高保真度的量子信息处理开辟了新的可能性。在量子比特的相互作用及构型调控方面，里德堡原子阵列具有高度的可编程性，并且可以实现高精度的量子比特操作，是构建大规模量子计算机的绝佳平台之一；同时，里德堡原子之间的相互作用也为确定性的光量子态调控提供了新的途径。结合里德堡原子阵列及里德堡量子光学这两个新兴的技术途径，我们计划研究基于里德堡原子的分布式量子计算：利用里德堡单原子阵列实现高保真度的局域量子计算模块，并通过里德堡量子光学技术实现模块之间的量子互联。我将介绍我们在这一方向的初步进展。我们实现了由几百个原子构成的无缺陷、可编程二维比特阵列的制备，里德堡态的高效操作，及高保真度的里德堡量子纠缠；实现了按需生成近乎完美的里德堡单光子，其纯度和不可分辨性均超过99.9％，展示了99.8％保真度的光量子逻辑门；并实现了里德堡光量子纠缠过滤器，可从极低保真度的输入态中提取高保真度的量子纠缠
Lin Li is a Professor at Huazhong University of Science and Technology. Lin’s research focuses on quantum information processing based on Rydberg atoms. Lin obtained his bachelor's degree from Nankai University in 2010 and completed his Ph.D. at the University of Michigan in 2016. From 2016 to 2018, he conducted postdoctoral research at the Max Planck Institute for Quantum Optics in Germany. In September 2018, he joined Huazhong University of Science and Technology and started his research group. Lin's notable contributions in the field of Rydberg atoms include the realization of many-body Rabi oscillations based on Rydberg atoms, deterministic entanglement between Rydberg atoms and photons, long-coherence time Rydberg quantum storage, high-quality Rydberg single-photon sources, high-fidelity quantum operations such as quantum logic gate, entanglement filter, and nonlocal single-photon transistor.
李霖，华中科技大学教授，国家海外青年人才计划入选者。2010年本科毕业于南开大学，2016年博士毕业于密歇根大学，2016至2018年在德国马克思普朗克量子光学研究所从事博士后研究，2018年9月加入华中科技大学。主要从事基于里德堡原子的量子信息相关实验研究，代表性工作包括实现了基于里德堡原子的多体拉比震荡，里德堡原子-光子确定性量子纠缠，长相干时间里德堡量子存储，高质量里德堡单光子源及高保真度光量子逻辑门，基于里德堡原子的确定性量子纠缠过滤器等。