Coherent spin control of s-, p-, d- and f-electrons in a silicon quantum dot

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Ross Leon
  • Chih Heng Yang
  • Jason Hwang
  • Julien Camirand Lemyre
  • Tuomo Tanttu
  • Wister Huang
  • Kok Wai Chan
  • Kuan Tan
  • Fay Hudson
  • Kohei Itoh
  • Andrea Morello
  • Arne Laucht
  • Michel Pioro-Ladriere
  • Andre Saraiva
  • Andrew S. Dzurak

Research units

  • The University of New South Wales
  • Université de Sherbrooke
  • University of New South Wales
  • Keio University

Abstract

Once the periodic properties of elements were unveiled, chemical behaviour could be understood in terms of the valence of atoms. Ideally, this rationale would extend to quantum dots, and quantum computation could be performed by merely controlling the outer-shell electrons of dot-based qubits. Imperfections in semiconductor materials disrupt this analogy, so real devices seldom display a systematic many-electron arrangement. We demonstrate here an electrostatically confined quantum dot that reveals a well defined shell structure. We observe four shells (31 electrons) with multiplicities given by spin and valley degrees of freedom. Various fillings containing a single valence electron—namely 1, 5, 13 and 25 electrons—are found to be potential qubits. An integrated micromagnet allows us to perform electrically-driven spin resonance (EDSR), leading to faster Rabi rotations and higher fidelity single qubit gates at higher shell states. We investigate the impact of orbital excitations on single qubits as a function of the dot deformation and exploit it for faster qubit control.

Details

Original languageEnglish
Article number797
Number of pages7
JournalNature Communications
Volume11
Issue number1
Publication statusPublished - 11 Feb 2020
MoE publication typeA1 Journal article-refereed

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