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

R. C. C. Leon (), C. H. Yang, J. C. C. Hwang, J. Camirand Lemyre, T. Tanttu, W. Huang, K. W. Chan, K. Y. Tan, F. E. Hudson, K. M. Itoh, A. Morello, A. Laucht, M. Pioro-Ladrière, A. Saraiva () and A. S. Dzurak ()
Additional contact information
R. C. C. Leon: The University of New South Wales
C. H. Yang: The University of New South Wales
J. C. C. Hwang: The University of New South Wales
J. Camirand Lemyre: Université de Sherbrooke
T. Tanttu: The University of New South Wales
W. Huang: The University of New South Wales
K. W. Chan: The University of New South Wales
K. Y. Tan: Aalto University
F. E. Hudson: The University of New South Wales
K. M. Itoh: Keio University
A. Morello: The University of New South Wales
A. Laucht: The University of New South Wales
M. Pioro-Ladrière: Université de Sherbrooke
A. Saraiva: The University of New South Wales
A. S. Dzurak: The University of New South Wales

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-019-14053-w

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