A singlet-triplet hole-spin qubit in MOS silicon
Holes in silicon quantum dots are promising for spin qubit applications due to the strong intrinsic spin-orbit coupling. The spin-orbit coupling produces complex hole-spin dynamics, providing opportunities to further optimise spin qubits. Here, we demonstrate a singlet-triplet qubit using hole states in a planar metal-oxide-semiconductor double quantum dot. We demonstrate rapid qubit control with singlet-triplet oscillations up to 400 MHz. The qubit exhibits promising coherence, with a maximum dephasing time of 600 ns, which is enhanced to 1.3 μs using refocusing techniques. We investigate the magnetic field anisotropy of the eigenstates, and determine a magnetic field orientation to improve the qubit initialisation fidelity. These results present a step forward for spin qubit technology, by implementing a high quality singlet-triplet hole-spin qubit in planar architecture suitable for scaling up to 2D arrays of coupled qubits.
Authors
- Dimitrie Culcer (ORCID: https://orcid.org/0000-0002-2342-0396)
- A. R. Hamilton (ORCID: https://orcid.org/0000-0001-7484-3738)
- Andrew S. Dzurak (ORCID: https://orcid.org/0000-0003-1389-5096)
- Wee Han Lim (ORCID: https://orcid.org/0000-0002-8821-2758)
- Ik Kyeong Jin (ORCID: https://orcid.org/0000-0002-8758-4197)
- Fay E. Hudson (ORCID: https://orcid.org/0000-0003-0134-3657)
- Joseph Hillier (ORCID: https://orcid.org/0000-0003-4418-0819)
- Rafael S. Eggli (ORCID: https://orcid.org/0009-0007-3483-8986)
- S. D. Liles (ORCID: https://orcid.org/0000-0001-8657-6681)
- Christopher C. Escott (ORCID: https://orcid.org/0000-0003-1458-2980)
- Jonathan Y. Huang (ORCID: https://orcid.org/0000-0002-1729-3052)
- M. J. Rendell (ORCID: https://orcid.org/0000-0003-1689-8356)
- Isaac Vorreiter (ORCID: https://orcid.org/0000-0001-6634-3493)
- Zhiwei Wang (ORCID: https://orcid.org/0000-0003-0182-2471)
- K.S. Kumar (ORCID: https://orcid.org/0000-0001-5318-4622)
- A. Shamim
- D. J. Halverson
Institutions
- University of Basel (CH)
- UNSW Sydney (AU)
- RIKEN Center for Emergent Matter Science (JP)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-09-03
- DOI
- https://doi.org/10.1038/s41467-024-51902-9
- Citations
- 21
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 7.09
Funders
- Australian National Fabrication Facility
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Army Research Office