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Simultaneous Operations in a Two-Dimensional Array of Singlet-Triplet Qubits
- Source :
- PRX Quantum 2, 040306 (2021)
- Publication Year :
- 2021
-
Abstract
- 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.<br />Comment: Revised version after peer review, with additional supporting data. 13 pages, 9 figures (including 4-page 4-figure supplement)
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- PRX Quantum 2, 040306 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2105.01392
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PRXQuantum.2.040306