RQC Seminar

275th RQC Seminar

• Speaker

  Dr. Giulio Biagioni
  ( Institut d'Optique )

• Date

  16:00-17:00, (4:00 p.m.-5:00 p.m.) Monday, June 22, 2026

• Venue

  Hybrid( Zoom,
  W319-321 Meeting Room, 3F, Cooperation Center, Wako Campus / 和光地区 研究交流棟3階 会議室 (W319-321) (S41))

• Title

  Collective light scattering in arrays of single dysprosium atoms

• Inquiries

  sylvain.deleseleuc[at]riken.jp

Abstract
While the interaction of light with a single quantum emitter is well understood, an ensemble of many emitters coupled by a resonant probe constitutes a complex open quantum system. Programmable arrays of atoms in optical tweezers are particularly appealing for studying such systems, as their geometrical ordering and flexibility enable the enhancement of collective behavior through constructive and destructive interference between emitters. I present a novel experimental apparatus that produces single dysprosium atoms trapped in one-dimensional tweezer arrays and cooled to their motional quantum ground state. For interparticle separations on the order of the transition wavelength, we observe collective light scattering, manifested as a Lamb shift of the 626 nm transition, detected in both the weak- and strong-excitation regimes. We also discuss recent experimental advances toward reaching the subwavelength regime, where many-body phenomena such as superradiance and subradiance are expected to emerge. These advances include the implementation of new optical microscopes with higher numerical aperture and an accordion lattice designed to transfer atoms from the tweezer array and compress their spacing to below 400 nm.