期刊
PRX QUANTUM
卷 2, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PRXQuantum.2.040306
关键词
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资金
- Innovation Fund Denmark
- Independent Research Fund Denmark
- EPSRC Doctoral Prize Fellowship
Researchers demonstrated a two-by-two array of four singlet-triplet qubits in gallium arsenide, showing 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 is utilized to demonstrate coherent spin exchange with selected qubits. These techniques can be extended to other materials, showing a path towards quantum processors with gate-controlled spin qubits.
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.
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