Single-spin qubits in isotopically enriched silicon at low magnetic field

R. Zhao, T. Tanttu, K. Y. Tan, B. Hensen, K. W. Chan, J. C.C. Hwang, R. C.C. Leon, C. H. Yang, W. Gilbert, F. E. Hudson, K. M. Itoh, A. A. Kiselev, T. D. Ladd, A. Morello, A. Laucht, A. S. Dzurak

Research output: Contribution to journalArticle

Abstract

Single-electron spin qubits employ magnetic fields on the order of 1 Tesla or above to enable quantum state readout via spin-dependent-tunnelling. This requires demanding microwave engineering for coherent spin resonance control, which limits the prospects for large scale multi-qubit systems. Alternatively, singlet-triplet readout enables high-fidelity spin-state measurements in much lower magnetic fields, without the need for reservoirs. Here, we demonstrate low-field operation of metal-oxide-silicon quantum dot qubits by combining coherent single-spin control with high-fidelity, single-shot, Pauli-spin-blockade-based ST readout. We discover that the qubits decohere faster at low magnetic fields with T2Rabi=18.6 μs and T2*=1.4 μs at 150 mT. Their coherence is limited by spin flips of residual 29Si nuclei in the isotopically enriched 28Si host material, which occur more frequently at lower fields. Our finding indicates that new trade-offs will be required to ensure the frequency stabilization of spin qubits, and highlights the importance of isotopic enrichment of device substrates for the realization of a scalable silicon-based quantum processor.

Original languageEnglish
Article number5500
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

Silicon
Magnetic Fields
Magnetic fields
silicon
magnetic fields
readout
Quantum Dots
Silicon oxides
Microwaves
Oxides
Semiconductor quantum dots
Stabilization
Metals
isotopic enrichment
Electrons
Equipment and Supplies
spin resonance
Substrates
electron spin
shot

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Zhao, R., Tanttu, T., Tan, K. Y., Hensen, B., Chan, K. W., Hwang, J. C. C., ... Dzurak, A. S. (2019). Single-spin qubits in isotopically enriched silicon at low magnetic field. Nature communications, 10(1), [5500]. https://doi.org/10.1038/s41467-019-13416-7

Single-spin qubits in isotopically enriched silicon at low magnetic field. / Zhao, R.; Tanttu, T.; Tan, K. Y.; Hensen, B.; Chan, K. W.; Hwang, J. C.C.; Leon, R. C.C.; Yang, C. H.; Gilbert, W.; Hudson, F. E.; Itoh, K. M.; Kiselev, A. A.; Ladd, T. D.; Morello, A.; Laucht, A.; Dzurak, A. S.

In: Nature communications, Vol. 10, No. 1, 5500, 01.12.2019.

Research output: Contribution to journalArticle

Zhao, R, Tanttu, T, Tan, KY, Hensen, B, Chan, KW, Hwang, JCC, Leon, RCC, Yang, CH, Gilbert, W, Hudson, FE, Itoh, KM, Kiselev, AA, Ladd, TD, Morello, A, Laucht, A & Dzurak, AS 2019, 'Single-spin qubits in isotopically enriched silicon at low magnetic field', Nature communications, vol. 10, no. 1, 5500. https://doi.org/10.1038/s41467-019-13416-7
Zhao, R. ; Tanttu, T. ; Tan, K. Y. ; Hensen, B. ; Chan, K. W. ; Hwang, J. C.C. ; Leon, R. C.C. ; Yang, C. H. ; Gilbert, W. ; Hudson, F. E. ; Itoh, K. M. ; Kiselev, A. A. ; Ladd, T. D. ; Morello, A. ; Laucht, A. ; Dzurak, A. S. / Single-spin qubits in isotopically enriched silicon at low magnetic field. In: Nature communications. 2019 ; Vol. 10, No. 1.
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