Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.117701
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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) Grant [JPMXS0118069228]
- JSPS KAKENHI [JP17K14078, 19K14640, 18H01819, JP26220710, JP16H02204]
- Murata Science Foundation Research Grant
- Grants-in-Aid for Scientific Research [19K14640, 18H01819] Funding Source: KAKEN
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We report implementation of a resonantly driven singlet-triplet spin qubit in silicon. The qubit is defined by the two-electron antiparallel spin states and universal quantum control is provided through a resonant drive of the exchange interaction at the qubit frequency. The qubit exhibits long T-2* exceeding 1 mu s that is limited by dephasing due to the Si-29 nuclei rather than charge noise thanks to the symmetric operation and a large micromagnet Zeeman field gradient. The randomized benchmarking shows 99.6% single gate fidelity which is the highest reported for singlet-triplet qubits.
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