Journal
NATURE NANOTECHNOLOGY
Volume 13, Issue 2, Pages 102-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41565-017-0014-x
Keywords
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Funding
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST) [JPMJCR15N2, JPMJCR1675]
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- RIKEN Incentive Research Projects
- Precursory Research for Embryonic Science and Technology (PRESTO) [JPMJPR16N3]
- JSPS KAKENHI [JP16H00817, JP17H05187, JP26220710, JP16H02204]
- Advanced Technology Institute Research Grant
- Murata Science Foundation Research Grant
- Izumi Science and Technology Foundation Research Grant
- TEPCO Memorial Foundation Research Grant
- Thermal and Electric Energy Technology Foundation Research Grant
- Telecommunications Advancement Foundation Research Grant
- Futaba Electronics Memorial Foundation Research Grant
- Foundation for Promotion of Material Science and Technology of Japan (MST) Foundation Research Grant
- Japan Society for the Promotion of Science [JP26709023, JP16F16806]
- KAKENHI [JP26220602]
- JSPS Core-to-Core Program
- Grants-in-Aid for Scientific Research [16H00817, 17K14078, 16F16806, 26220602, 26220710, 17H05187, 26709023] Funding Source: KAKEN
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The isolation of qubits from noise sources, such as surrounding nuclear spins and spin-electric susceptibility(1-4), has enabled extensions of quantum coherence times in recent pivotal advances towards the concrete implementation of spin-based quantum computation. In fact, the possibility of achieving enhanced quantum coherence has been substantially doubted for nanostructures due to the characteristic high degree of background charge fluctuations(5-7). Still, a sizeable spin-electric coupling will be needed in realistic multiple-qubit systems to address single-spin and spin-spin manipulations(8-10). Here, we realize a single-electron spin qubit with an isotopically enriched phase coherence time (20 mu s)(11,12) and fast electrical control speed (up to 30 MHz) mediated by extrinsic spin-electric coupling. Using rapid spin rotations, we reveal that the free-evolution dephasing is caused by charge noise-rather than conventional magnetic noise-as highlighted by a 1/f spectrum extended over seven decades of frequency. The qubit exhibits superior performance with single-qubit gate fidelities exceeding 99.9% on average, offering a promising route to large-scale spin-qubit systems with fault-tolerant controllability.
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