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arXiv · 2511.04310

Many-body interferometry with semiconductor spins

Daniel Jirovec·Stefano Reale·Pablo Cova-Fariña·Christian Ventura-Meinersen·Minh T. P. Nguyen·Xin Zhang·Stefan D. Oosterhout·Giordano Scappucci·Menno Veldhorst·Maximilian Rimbach-Russ·Stefano Bosco·Lieven M. K. Vandersypen
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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.

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Daniel Jirovec, Stefano Reale, Pablo Cova-Fariña, Christian Ventura-Meinersen, Minh T. P. Nguyen, Xin Zhang, Stefan D. Oosterhout, Giordano Scappucci, Menno Veldhorst, Maximilian Rimbach-Russ, Stefano Bosco, Lieven M. K. Vandersypen. 2025-11-06. Many-body interferometry with semiconductor spins. https://doi.org/10.1126/science.aed4177

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