Many-body interferometry with semiconductor spins
Abstract
Quantum simulators enable studies of many-body phenomena which are intractable with classical hardware. Spins in devices based on semiconductor quantum dots promise precise electrical control and scalability advantages, but accessing many-body phenomena has so far been restricted by challenges in nanofabrication and simultaneous control of multiple interactions. Here, we perform spectroscopy of up to eight interacting spins using a 2x4 array of gate-defined germanium quantum dots. The spectroscopy protocol is based on Ramsey interferometry and adiabatic mapping of many-body eigenstates to single-spin eigenstates, enabling a complete energy spectrum reconstruction. As the interaction strength exceeds magnetic disorder, we observe signatures of the crossover from localization to a chaotic phase marking a step towards the observation of many-body phenomena in quantum dot systems.
Cite
@article{arxiv.2511.04310,
title = {Many-body interferometry with semiconductor spins},
author = {Daniel Jirovec and Stefano Reale and Pablo Cova-Fariña and Christian Ventura-Meinersen and Minh T. P. Nguyen and Xin Zhang and Stefan D. Oosterhout and Giordano Scappucci and Menno Veldhorst and Maximilian Rimbach-Russ and Stefano Bosco and Lieven M. K. Vandersypen},
journal= {arXiv preprint arXiv:2511.04310},
year = {2026}
}