March 2025

Abstracts of the Quantum Center Lunch Seminar

Date: Thursday, March 6, 2025
Place: ETH Zurich, Hönggerberg, HPF G 6
Time: 12:00 - 13:30

Toward Excitonic Condensation in van der Waals Heterostructures

Alperen Tugen - Quantum Photonics Group (Imamoglu Group), ETH Zurich

Interlayer excitons—electron-hole pairs spatially separated across atomic layers—provide a promising route to explore correlated quantum phenomena, including excitonic superfluidity and Bose-Fermi mixtures in two-dimensional (2D) materials. In our work, we construct a heterostructure by stacking transition metal dichalcogenide (TMD) monolayers separated by only a few layers of hexagonal boron nitride (hBN), facilitating the formation of these dipolar interlayer excitons. Using Rydberg excitons as a sensitive probe, we observe remarkably long exciton lifetimes, extending up to ten microseconds. In this talk, I will outline our ongoing efforts to develop an entirely optical approach aimed at probing the emergent many-body effects of interlayer excitons.

Quantum information processing with dual-type dual-element atom arrays

Zhanchuan Zhang - Experimental Quantum Engineering (Xu Group), ETH Zurich

Neutral atoms trapped in optical tweezer arrays have emerged as a highly promising platform for both digital quantum computation and analog quantum simulation. Despite the rapid progress, further development of this platform faces several challenges including reconfigurable individual addressability and non-demolition detection of a subset of atoms without crosstalk.
In this talk, I will present a new architecture that combines arrays of Yb single atoms and Rb atomic ensembles to address these difficulties. By harnessing the controllable interactions between individual atoms and atomic ensembles, as well as the strong collective optical effects within ensembles, we develop a versatile toolbox for reconfigurable individual quantum control over quantum states and rapid non-demolition detection of single and multi-qubit states. These schemes open up new opportunities to implement measurement-based quantum processing protocols and fault-tolerant quantum computation.