Journal
NATURE NANOTECHNOLOGY
Volume 16, Issue 9, Pages 965-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41565-021-00925-0
Keywords
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Funding
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST) [JPMJCR15N2, JPMJCR1675]
- MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) [JPMXS0118069228]
- JST Moonshot RD grant [JPMJMS2065]
- JSPS KAKENHI [16H02204, 17K14078, 18H01819, 19K14640, 20H00237]
- Murata Science Foundation Research Grant
- JST, PRESTO grant [JPMJPR2017]
- Grants-in-Aid for Scientific Research [19K14640, 20H00237, 18H01819, 17K14078] Funding Source: KAKEN
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Silicon-based spin qubits offer outstanding nanofabrication capability and have demonstrated improved coherence times, high-fidelity all-electrical control, high-temperature operation, and quantum entanglement of two spin qubits. These results showcase the potential of silicon-based spin qubit platforms for multiqubit quantum algorithms.
Quantum entanglement is a fundamental property of coherent quantum states and an essential resource for quantum computing'. In large-scale quantum systems, the error accumulation requires concepts for quantum error correction. A first step toward error correction is the creation of genuinely multipartite entanglement, which has served as a performance benchmark for quantum computing platforms such as superconducting circuits(2,3), trapped ions(4) and nitrogen-vacancy centres in diamonds. Among the candidates for large-scale quantum computing devices, silicon-based spin qubits offer an outstanding nanofabrication capability for scaling-up. Recent studies demonstrated improved coherence times(6-8), high-fidelity all-electrical control(9-13), high-temperature operation(14,15) and quantum entanglement of two spin qubits(9,11,12). Here we generated a three-qubit Greenberger-Horne-Zeilinger state using a low-disorder, fully controllable array of three spin qubits in silicon. We performed quantum state tomography(16) and obtained a state fidelity of 88.0%. The measurements witness a genuine Greenberger-Horne-Zeilinger class quantum entanglement that cannot be separated into any biseparable state. Our results showcase the potential of silicon-based spin qubit platforms for multiqubit quantum algorithms.
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