• CQuIC Seminars

February 18, 2026 11:00 AM - February 18, 2026 12:00 PM
PAIS 2540

Host:

Paco Salces

Presenter:

Qiyu Liang

Zoom Link

Abstract: Rydberg atoms provide a uniquely versatile platform for engineering strong, tunable interactions in otherwise weakly interacting neutral-atom systems. They couple strongly to each other and to external fields. The former enables controllable atom-atom, atom-photon and even photon-photon interactions, while the latter promises exceptionally sensitive and broadband microwave (MW) and radio frequency (RF) sensing capabilities. Typically, the Rydberg-Rydberg interactions are leveraged as a blockade mechanism. In contrast, we explore the antiblockade regime in atom arrays, where interactions facilitate rather than suppress excitation. I will present our numerical studies demonstrating directional quantum information and entanglement transfer [1], as well as robust avalanche amplification for weak signal detection [2]. For atom-field coupling, I will present our experimental work expanding MW sensing capabilities with cold atomic ensembles. First, we demonstrate 3D field characterization via multi-parameter extraction, which holds potential as a testbed for machine-learning-enhanced measurement protocols and has broad implications for information extraction from complex measurements. Second, we address the intersection of atom-atom and atom-field interactions by investigating the role of nonlinear atomic interactions in probing external fields. Together, these studies show how tailoring Rydberg interactions expands the accessible measurement and dynamical capabilities of cold-atom platforms.

References:
[1] Yupeng Wang, Junjie Wang, Aishik Panja, Xinghan Wang, Qi-Yu Liang, “Directional Transport in Rydberg Atom Arrays via Kinetic Constraints and Temporal Modulation”, Phys. Rev. Research 7, L022035 (2025)
[2] Xinghan Wang, Yupeng Wang, Qi-Yu Liang, “Robust Rydberg facilitation via rapid adiabatic passage”, arXiv:2510.01504 (2025)

Zoom password availible upon request, email nlordi AT unm.edu