Journal
PHYSICAL REVIEW X
Volume 10, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.10.011060
Keywords
Condensed Matter Physics; Quantum Information; Spintronics
Categories
Funding
- CREST, JST [JPMJCR15N2, JPMJCR1675]
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- JSPS KAKENHI [16H00817, 17H05187, 26220710, 18H01819, 19K14640, 16K05411]
- RIKEN Incentive Research Projects
- Murata Science Foundation
- MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) [JPMXS01180 69228]
- PRESTO, JST [JPMJPR16N3]
- The Mikiya Science and Technology Foundation Research Grant
- Harmonic Ito Foundation Research Grant
- Takahashi Industrial and Economic Research Foundation Research Grant
- Thermal and Electric Energy Technology Foundation Research Grant
- Telecommunications Advancement Foundation Research Grant
- Futaba Electronics Memorial Foundation Research Grant
- MST Foundation Research Grant
- BMBF-Q.Link.X [16KIS0867]
- DFH/UFA [CDFA-05-06]
- [DFG-TRR160]
- Grants-in-Aid for Scientific Research [17H05187, 16H00817, 19K14640, 18H01819] Funding Source: KAKEN
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The coherence of electron spin qubits in semiconductor quantum dots suffers mostly from low-frequency noise. During the past decade, efforts have been devoted to mitigate such noise by material engineering, leading to substantial enhancement of the spin dephasing time for an idling qubit. However, the role of the environmental noise during spin manipulation, which determines the control fidelity, is less understood. We demonstrate an electron spin qubit whose coherence in the driven evolution is limited by high-frequency charge noise rather than the quasistatic noise inherent to any semiconductor device. We employ a feedback-control technique to actively suppress the latter, demonstrating a p-flip gate fidelity as high as 99.04 +/- 0.23% in a gallium arsenide quantum dot. We show that the driven-evolution coherence is limited by the longitudinal noise at the Rabi frequency, whose spectrum resembles the 1/f noise observed in isotopically purified silicon qubits.
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