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- Title
Optimisation of electron spin qubits in electrically driven multi-donor quantum dots.
- Authors
Sarkar, Abhikbrata; Hochstetter, Joel; Kha, Allen; Hu, Xuedong; Simmons, Michelle Y.; Rahman, Rajib; Culcer, Dimitrie
- Abstract
Multi-donor quantum dots have been at the forefront of recent progress in Si-based quantum computation. Among them, 2P: 1P spin qubits have a built-in dipole moment, making them ideal for electron dipole spin resonance (EDSR) using the donor hyperfine interaction, and thus all-electrical spin operation. We report fast EDSR, with Tπ ~ 10 − 50 ns and a Rabi ratio (T1/Tπ) ~ 106. The fastest EDSR time Tπ occurs when the 2P: 1P axis is ∥ [111], while the best Rabi ratio occurs when it is ∥ [100]. Sensitivity to random telegraph noise due to nearby charge defects depends strongly on the location of the nearby defects. The qubit is robust against 1/f noise provided it is operated away from the charge anti-crossing. Entanglement via exchange is several orders of magnitude faster than dipole-dipole coupling. These findings pave the way towards fast, low-power, coherent and scalable donor dot-based quantum computing.
- Subjects
QUANTUM dots; QUBITS; QUANTUM computing; ELECTRON spin; ELECTRON paramagnetic resonance; PINK noise
- Publication
NPJ Quantum Information, 2022, Vol 8, Issue 1, p1
- ISSN
2056-6387
- Publication type
Article
- DOI
10.1038/s41534-022-00646-9