A silicon quantum-dot-coupled nuclear spin qubit

Bas Hensen, Wister Wei Huang, Chih Hwan Yang, Kok Wai Chan, Jun Yoneda, Tuomo Tanttu, Fay E. Hudson, Arne Laucht, Kohei M. Itoh, Thaddeus D. Ladd, Andrea Morello, Andrew S. Dzurak

Research output: Contribution to journalLetter

Abstract

Single nuclear spins in the solid state are a potential future platform for quantum computing1–3, because they possess long coherence times4–6 and offer excellent controllability7. Measurements can be performed via localized electrons, such as those in single atom dopants8,9 or crystal defects10–12. However, establishing long-range interactions between multiple dopants or defects is challenging13,14. Conversely, in lithographically defined quantum dots, tunable interdot electron tunnelling allows direct coupling of electron spin-based qubits in neighbouring dots15–20. Moreover, the compatibility with semiconductor fabrication techniques21 may allow for scaling to large numbers of qubits in the future. Unfortunately, hyperfine interactions are typically too weak to address single nuclei. Here we show that for electrons in silicon metal–oxide–semiconductor quantum dots the hyperfine interaction is sufficient to initialize, read out and control single 29Si nuclear spins. This approach combines the long coherence times of nuclear spins with the flexibility and scalability of quantum dot systems. We demonstrate high-fidelity projective readout and control of the nuclear spin qubit, as well as entanglement between the nuclear and electron spins. Crucially, we find that both the nuclear spin and electron spin retain their coherence while moving the electron between quantum dots. Hence we envision long-range nuclear–nuclear entanglement via electron shuttling3. Our results establish nuclear spins in quantum dots as a powerful new resource for quantum processing.

Original languageEnglish
JournalNature Nanotechnology
DOIs
Publication statusAccepted/In press - 2019 Jan 1

Fingerprint

Silicon
nuclear spin
Semiconductor quantum dots
quantum dots
Electrons
silicon
electron spin
electrons
Electron tunneling
interactions
electron tunneling
compatibility
readout
Scalability
resources
flexibility
platforms
Doping (additives)
Semiconductor materials
solid state

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Hensen, B., Wei Huang, W., Yang, C. H., Wai Chan, K., Yoneda, J., Tanttu, T., ... Dzurak, A. S. (Accepted/In press). A silicon quantum-dot-coupled nuclear spin qubit. Nature Nanotechnology. https://doi.org/10.1038/s41565-019-0587-7

A silicon quantum-dot-coupled nuclear spin qubit. / Hensen, Bas; Wei Huang, Wister; Yang, Chih Hwan; Wai Chan, Kok; Yoneda, Jun; Tanttu, Tuomo; Hudson, Fay E.; Laucht, Arne; Itoh, Kohei M.; Ladd, Thaddeus D.; Morello, Andrea; Dzurak, Andrew S.

In: Nature Nanotechnology, 01.01.2019.

Research output: Contribution to journalLetter

Hensen, B, Wei Huang, W, Yang, CH, Wai Chan, K, Yoneda, J, Tanttu, T, Hudson, FE, Laucht, A, Itoh, KM, Ladd, TD, Morello, A & Dzurak, AS 2019, 'A silicon quantum-dot-coupled nuclear spin qubit', Nature Nanotechnology. https://doi.org/10.1038/s41565-019-0587-7
Hensen B, Wei Huang W, Yang CH, Wai Chan K, Yoneda J, Tanttu T et al. A silicon quantum-dot-coupled nuclear spin qubit. Nature Nanotechnology. 2019 Jan 1. https://doi.org/10.1038/s41565-019-0587-7
Hensen, Bas ; Wei Huang, Wister ; Yang, Chih Hwan ; Wai Chan, Kok ; Yoneda, Jun ; Tanttu, Tuomo ; Hudson, Fay E. ; Laucht, Arne ; Itoh, Kohei M. ; Ladd, Thaddeus D. ; Morello, Andrea ; Dzurak, Andrew S. / A silicon quantum-dot-coupled nuclear spin qubit. In: Nature Nanotechnology. 2019.
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