Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits
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Dokumenter
- PRXQuantum.2.040306
Forlagets udgivne version, 3,69 MB, PDF-dokument
In many physical approaches to quantum computation, error-correction schemes assume the ability to form two-dimensional qubit arrays with nearest-neighbor couplings and parallel operations at multiple qubit sites. While semiconductor spin qubits exhibit long coherence times relative to their operation speed and single-qubit fidelities above error correction thresholds, multiqubit operations in two-dimensional arrays have been limited by fabrication, operation, and readout challenges. We present a two-by-two array of four singlet-triplet qubits in gallium arsenide and show simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable interqubit link, which we utilize to demonstrate coherent spin exchange with selected qubits. Our techniques are extensible to other materials, indicating a path towards quantum processors with gate-controlled spin qubits.
Originalsprog | Engelsk |
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Artikelnummer | 040306 |
Tidsskrift | PRX Quantum |
Vol/bind | 2 |
Udgave nummer | 4 |
Antal sider | 12 |
ISSN | 2691-3399 |
DOI | |
Status | Udgivet - 8 okt. 2021 |
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