Agenda

Christopher Bauerle, équipe QuantECA, présentera
le séminaire mensuel NÉEL

Mardi 7 octobre 2025 à 9h30
Salle Nevill Mott, D420

Titre : Basic Science & Quantum Technology using flying electrons

Résumé :
Decades of intensive research have focused on the precise control of single electrons, a key requirement for establishing the electrical current standard in the SI unit system. More recently, the concept of flying electron qubits has emerged: here, the charge or spin degree of freedom of an electron serves as a qubit, which can be manipulated and transported through electronic circuits using simple electromagnetic fields [1]. Despite the progress, significant challenges remain, particularly in achieving high-fidelity control and scalable quantum circuit design.

In this talk, I will provide an overview of our research over the past years, which includes high-fidelity transport of single electrons using surface acoustic waves, as well as controlled collision experiments between two electrons [2] that reveal extremely strong Coulomb interactions—interactions that can be directly harnessed for quantum technologies.

On a more fundamental note, I will show how precise control over the number of electrons in on-chip collision experiments allows us to probe the system’s phase diagram. By drawing analogies with heavy-ion collider experiments, we can demonstrate that even a droplet of just three electrons behaves as a correlated state—a Coulomb liquid [3].

If time allows, I will also provide a brief overview of what we will try to achieve in my ERC project, UltraWave [4].

[1] C. Bäuerle et al., Reports on Progress in Physics 81, 056503 (2018)
[2] J. Wang et al., Nature Nanotechnology 18, 721 (2023)
[3] J. Shaju et al., Nature 642, 928–933 (2025)
[4] https://cordis.europa.eu/project/id/101201077