Abstract:

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, high-fidelity Rydberg state entanglement, single qubit gate fidelity of ~99.9%, and two-qubit gate fidelity of ~95%. 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.

Short Bio:

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, 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.