2020/10/20 by Kenta Takeda, Akito Noiri, Takashi Nakajima +3 · 1 citation
Computer Science · Materials Science · Physics and Astronomy · #Diamond and Carbon-based Materials Research #One-way quantum computer #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum entanglement #Quantum error correction #Quantum network #Quantum sensor #Quantum technology #Quantum tomography #Qubit #W state #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1038/s41565-021-00925-0
published as Nature Nanotechnology (2021)
arxiv created 2020/10/20 · openalex created_date 2020/10/29 · openalex publication_date 2021/06/07 · arxiv updated 2021/06/17 · openalex updated_date 2026/08/05
Quantum entanglement is a fundamental property of coherent quantum states and an essential resource for quantum computing. While two-qubit entanglement has been demonstrated for spins in silicon, creation of multipartite entanglement, a first step toward implementing quantum error correction, has remained challenging due to the difficulties in controlling a multi-qubit array, such as device disorder, magnetic and electrical noises and exacting exchange controls. Here, we show operation of a fully functional three-qubit array in silicon and generation of a three-qubit Greenberger-Horne-Zeilinger (GHZ) state. We obtain a state fidelity of 88.0 percent by quantum state tomography, which witnesses a genuine GHZ-class quantum entanglement that is not biseparable. Our result shows the potential of silicon-based qubit platform for demonstrations of multiqubit quantum algorithms.