Many-body interferometry with semiconductor spins.
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| Title: | Many-body interferometry with semiconductor spins. |
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| Authors: | Jirovec, D. (AUTHOR), Reale, S. (AUTHOR), Cova Fariña, P. (AUTHOR), Ventura-Meinersen, C. (AUTHOR), Nguyen, M. P. (AUTHOR), Zhang, X. (AUTHOR), Oosterhout, S. D. (AUTHOR), Scapucci, G. (AUTHOR), Veldhorst, M. (AUTHOR), Rimbach-Russ, M. (AUTHOR), Bosco, S. (AUTHOR), Vandersypen, L. M. K. (AUTHOR) |
| Source: | Science. 4/9/2026, Vol. 392 Issue 6794, p183-187. 5p. |
| Subjects: | Quantum dots, Qubits, Interferometers, Quantum dot devices, Spectrometry |
| 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. Editor's summary: The use of quantum systems allows the simulation of complex many-body interacting systems otherwise intractable to classical computational methods. Whereas methods based on cold atoms, trapped ions, and superconducting circuits are now relatively large, solid-state–based systems offer the flexibility of individual qubit control and complementary metal-oxide semiconductor compatibility, but they have been limited in size. Jirovec et al. developed a scalable route to probing and controlling collective quantum states in semiconductor spin qubit arrays. By fabricating a 2 × 4 array of gate-defined quantum dots, they extracted spectroscopic information from the interacting array as the coupling between qubits was varied. These results demonstrate a key step toward realizing solid-state quantum simulators. —Ian S. Osborne [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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