Title：Long-Range Entanglement in Superconducting Circuits: From Coupler Chains to Microwave Photonic Graph States
Speaker：Xi Dai, ETH Zurich
Time：10:00‑12:00, Tuesday, August 25, 2026
Venue：Shishan Quantum Computation and Quantum Detection Laboratory
Tencent Meeting ID：189-842-134
Abstract
Long-range connectivity is one of the most sought-after features in superconducting quantum processors today. It enables more efficient circuit compilation, more compact encoding of logical qubits, and scalability beyond the single-chip, single-fridge limits; in quantum annealing specifically, it allows more efficient embedding of realistic optimization problems. In this talk, I will present two complementary work towards realizing long-range entanglement. The first uses a tunable coupler chain to mediate long-range correlations between distant superconducting flux qubits on the same chip, demonstrating precise control over a complex multi-element coupling network. The second moves beyond the chip: generating and characterizing large-scale microwave photonic graph states. Such states can transmit quantum information with tolerance against photon loss. Together, these demonstrations support the development of multiqubit superconducting modules, with high-fidelity interconnects between them.
Speaker Biography
Dr. Xi Dai is currently a Postdoctoral Researcher at ETH Zurich. His research focuses on quantum optics and quantum communication based on superconducting circuits. He obtained his Ph.D. in quantum information from the University of Waterloo, where his work centered on superconducting devices for quantum annealing. Prior to that, he received his Bachelor’s and Master’s degrees in Physics and Philosophy from the University of Oxford.
