Many-body interferometry with semiconductor spins
D. Jirovec (TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
S. Reale (TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
P. Cova Fariña (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
C. Ventura-Meinersen (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Rimbach-Russ)
M. P. Nguyen (Kavli institute of nanoscience Delft, TU Delft - BN/Arjen Jakobi Lab, TU Delft - QuTech Advanced Research Centre)
X. Zhang (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/Quantum Delft)
S. D. Oosterhout (TU Delft - QN/Kavli Nanolab Delft, TNO)
G. Scappucci (TU Delft - QCD/Scappucci Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - Quantum Circuit Architectures and Technology)
M. Veldhorst (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QN/Veldhorst Lab, TU Delft - QCD/Veldhorst Lab)
M. Rimbach-Russ (TU Delft - QCD/Rimbach-Russ, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
S. Bosco (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Bosco Group, Kavli institute of nanoscience Delft)
L. M.K. Vandersypen (TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Vandersypen Lab, Kavli institute of nanoscience Delft, TU Delft - QN/Vandersypen Lab)
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Abstract
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.
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