Many-body interferometry with semiconductor spins
Summary
Quantum simulators enable studies of many-body phenomena, which are intractable with classical hardware. The manipulation of electronic spin states in devices based on semiconductor quantum dots promises 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. In this study, we performed spectroscopy of up to eight interacting spins using a 2-×-4 ar
Content
# Many-body interferometry with semiconductor spins
*Published: 2026 Apr 9*
Quantum simulators enable studies of many-body phenomena, which are intractable
with classical hardware. The manipulation of electronic spin states in devices
based on semiconductor quantum dots promises 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. In this study, we performed spectroscopy of up to eight
interacting spins using a 2-×-4 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 complete
energy spectrum reconstruction. As the interaction strength exceeds magnetic
disorder, we observed signatures of the crossover from localization to a chaotic
phase marking a step toward the observation of many-body phenomena in quantum
dot systems.
DOI: 10.1126/science.aed4177